Which of the following reasons would you tell him is a good reason for defragmenting a hard drive?

You are working as a technician at AIOTestKing.com. One of the new technicians wonder when he should defragment a hard drive. Which of the following reasons would you tell him is a good reason for defragmenting a hard drive? (Select TWO).

A.
Optimize startup speed.

B.
Removes quarantined viruses.

C.
Optimizes RAM speed.

D.
Optimize file system efficiency.

E.
Allows the Registry to load faster.