Which of the following can compromise the password of your systems network? (Choose all that apply)

A.
Self-reminder notes of the employees of there passwords.

B.
People claiming to be IT engineers, performing legitimate work.

C.
Server room passwords using personal information

D.
None of the above.

Explanation:
Self-reminder notes People claiming to be IT engineers, and passwords using personal information, is not a good way of securing your networks.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, p. 465.