Which of the following tasks is NOT performed by antiviruses?

Activity blocking is a standard antivirus capability that prevents suspicious or malicious processes from executing on the host based on behavioral rules.

Heuristic scanning is a core antivirus technique used to detect unknown or zero-day malware by analyzing code behavior and structure rather than relying solely on known signatures.

Integrity scanning is performed by antivirus software to detect unauthorized file modifications by comparing current file hashes or attributes against a trusted baseline.

Session hijacking is an offensive attack technique in which an adversary takes control of an authenticated network session belonging to another user, which antivirus software is not designed to perform. Antivirus tools are limited to defensive functions such as detecting, quarantining, and removing malicious code - not executing network-layer attacks.