Which of the following does not require manual cleaning?

A.
Server hard disks.

B.
CDs.

C.
Server mice.

D.
Server keyboards.

Explanation:
You do not have to manually clean server hard disks. This is primarily due to server hard disks being stored within a sealed unit.
Incorrect
Answers:
B: CDs can be cleaned using lint-free cloths.
C, D: Server mice and keyboards should be cleaned using the correct cleaning materials and processes.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 451-454.