What Is a Destructive Agent

What is a destructive agent?

A) a form of social engineering in which one individual lies to obtain confidential data about another individual
B) a hacker looks through your trash to find personal information
C) legitimate users who purposely or accidentally misuse their access to the environment and cause some kind of business-affecting incident
D) malicious agents designed by spammers and other Internet attackers to farm email addresses off websites or deposit spyware on machines