Your network has been hit by a very bad virus recently. As you tracked the virus through the
network, it was changing from system, to system. Each time it went to infect a system; it had
evolved slightly to have a different file size, or different file structure. After extensive work, you and
your team were able to isolate and remove the virus from the network. Which of the following best
identifies the type of virus that was in your network?

A.
Boot Sector Virus

B.
Macro Virus

C.
Stealth Virus

D.
Multi-part Virus

E.
Polymorphic Virus