Which of the following can cause an ESD? (Choose all that apply)

Which of the following can cause an ESD? (Choose all that apply)

A.
A water leak

B.
Dust

C.
The humidity of the room

D.
None of the above

Explanation:
B: Dust facilitates electrical arcing and is another contributor to ESD.
C: The server room should also be reasonably humidified to reduce the likelihood of

damaging electrostatic discharge (ESD) occurring Incorrect Answers: A: A discolor ceiling is an indication of a water leak. It can also goes on to the circuit board and damage the networks.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, p 475