Which of the following describes a logic bomb?

A program that has no useful purpose, but attempts to spread itself to other systems and often damages resources on the systems where it is found.

A type of malicious code similar to a virus whose primary purpose is to duplicate itself and spread while not necessarily intentionally damaging or destroying resources.

A program that performs a malicious activity at a specific time or after a triggering event.

A program that appears to be a legitimate application, utility, game, or screensaver that performs malicious activities surreptitiously.