Which of the following is the BEST example of social engineering?

Impersonation is a social engineering attack where an attacker pretends to be a trusted person - such as an IT technician, executive, or vendor - to manipulate a victim into divulging credentials or granting access. It targets human trust rather than exploiting a software or hardware vulnerability.

A key logger is a technical malware-based attack that records keystrokes; it does not involve manipulating a person through deception.

A virus is malicious software that spreads and executes code; it is a technical threat, not a social manipulation technique.

A malicious cookie is a technical web-based attack used to hijack sessions or track users; it does not involve human deception.