How much preventative maintenance is needed on the interior of server cases?

A.
Low levels of preventative maintenance.

B.
High levels of preventative maintenance.

C.
Both of the above.

Explanation:
The interior of server cases requires high levels of care and caution when it comes to preventative maintenance. For the interior of server cases, you would need to turn off a server before cleaning its interior. Because the exterior of server cases contain no operational components or moving parts, low levels of preventative maintenance is required for exterior surfaces of server cases. You do not even need to turn off a server before cleaning of a server’s exterior surface.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 450-451.