You have discovered that the ls, su and ps commands no longer function as expected. They do
not return information in a manner similar to any other Linux system. Also, the implementation of
Tripwire you have installed on this server is returning new hash values. Which of the following has
most likely occurred?

A.
Atrojan has attacked the system.

B.
A SQL injection attack has occurred.

C.
A spyware application has been installed.

D.
A root kit has been installed on the system.