What defines a logic bomb in computer security?

A logic bomb is defined as a type of malware that is programmed to execute a specific action when certain conditions or logical criteria are met. This means the program remains dormant and does not activate until a predefined event occurs, such as a particular date, the opening of a specific file, or the occurrence of a certain user action. This makes option B the correct choice, as it highlights that the activation of a logic bomb is contingent upon a specific logical event.

The other options do not accurately describe a logic bomb. A random virus that spreads without user intervention refers more to a traditional virus that replicates on its own rather than activating under specific conditions. A secure file preventing unauthorized access pertains to data protection rather than a malicious act. Lastly, an advanced encryption method relates to securing data through encryption rather than executing actions based on logical parameters. Understanding these distinctions clarifies why the second option is the correct definition of a logic bomb.