Which of the following would be a benefit of testing a program of an unknown source on a virtual machine?

A.
Virtual machines render it impossible for the code to escape.

B.
Virtual machines allow for faster performance, so the speed of benchmark testing is increased.

C.
Virtual machines come equipped with a firewall by default, thus preventing outside contamination.

D.
Virtual machines can easily be restored to an earlier point if the code is malicious or causes instability.