Q.After practicals, Atharv left the computer laboratory but forgot to sign off from his email account. Later, his classmate Revaan started using the same computer and, still logged in as Atharv, sent inflammatory email messages to a few classmates using Atharv's account. Revaan's activity is an example of which of the following cyber crimes —

This is a plain theory question — it asks you to identify a cyber crime from a list and justify the choice.

The key fact in the scenario is that Revaan used Atharv's already-logged-in email account without permission. He did not break into the system or crack a password — he simply exploited Atharv's failure to sign off. The crime here is impersonation for a malicious purpose.

Let's examine each option:

• (a) Hacking — Hacking involves unauthorised access to a computer system or network, typically by bypassing security measures. Revaan did not hack anything; the system was already open. So this is wrong.
• (b) Identity theft — Identity theft means stealing someone's personal information (like name, email, password) and using it to impersonate them. Revaan used Atharv's email account while it was still logged in, which is a form of identity theft — he assumed Atharv's digital identity to send messages. This fits.
• (c) Cyber bullying — Cyber bullying is the act of harassing, threatening, or humiliating someone online. While Revaan sent inflammatory messages, the crime in the question is the method he used (impersonation), not the outcome. The question asks what Revaan's activity is an example of — and the activity is using someone else's identity, not the bullying itself. So this is not the best answer.
• (d) Plagiarism — Plagiarism is presenting someone else's work as your own. Sending emails under someone else's name is not plagiarism; it's impersonation. So this is wrong.

This is a MCQ question with four options. Let's work through the reasoning step by step.

The core idea here is Identity Theft. Identity theft occurs when someone pretends to be another person by using their personal information — like a name, account credentials, or digital identity — without authorization, typically to commit fraud or cause harm. Revaan did not break into Atharv's account by guessing passwords or exploiting software vulnerabilities; he simply used the session that Atharv left open. But that is still identity theft: he was impersonating Atharv in the digital world, sending messages that appeared to come from Atharv. The key is the unauthorized use of someone else's identity, not the method of gaining access.

Now let's examine each option to see why the others are wrong.

1. Hacking — Hacking specifically means gaining unauthorized access to a computer system or account by bypassing security measures (e.g., cracking a password, exploiting a bug). Revaan did not hack anything; Atharv's account was already logged in. No security was broken. So this is not hacking.
2. Identity theft — This fits perfectly. Revaan used Atharv's identity (his email account, which is a digital representation of Atharv) without permission to send messages. The act of impersonation is the essence of identity theft.
3. Cyber bullying — Cyber bullying is the use of digital communication to harass, threaten, or humiliate someone. While Revaan's messages were inflammatory and could be part of bullying, the question asks what type of cyber crime Revaan's activity is an example of. The crime he committed first was identity theft — he assumed Atharv's identity. The bullying was the consequence of that identity theft. The question is about the nature of the act itself (using someone else's account), not the outcome. So identity theft is the more precise classification.
4. Plagiarism — Plagiarism is presenting someone else's work or ideas as your own, typically in academic or creative contexts. Sending inflammatory emails has nothing to do with claiming authorship of someone else's work. This is irrelevant.
   Watch out

   A common mistake is to pick Cyber bullying because the messages were inflammatory. But the question asks what Revaan's activity (using Atharv's account) is an example of, not what the messages are an example of. The act of using the account is identity theft; the content of the messages is a separate issue.

   ✓Final answer

   The correct option is (b) — Identity theft. Revaan used Atharv's logged-in email account without permission, thereby assuming his digital identity to send messages, which is the defining characteristic of identity theft.