Which of the following statements is TRUE? (Choose all that apply)

A.
Dust is an indication of air sources other than those associated with the server room’s access door.

B.
Dust can cause the ceiling to be discolored.

C.
The size and style of the server chassis has an effect on airflow.

D.
None of the above

Explanation:
A: The presence of dust on the equipment can indicate the intrusion of air sources other than those associated with the server room’s access door. This dust translates to eventual equipment overheating.
C: The size and style of the server chassis also have a major effect on airflow.
Incorrect Answers:
B: Discolored ceiling tiles can indicate the existence of some type of water leak.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 474, 475