On the topic of configuration errors, choose the statement(s) that is TRUE. Choose all that apply.

A.
Configuration errors typically occur when you install a new server system.

B.
Configuration errors typically occur when you add additional hardware or software.

C.
Configuration errors usually show themselves before the operating system loads.

D.
All of the above.

Explanation:
All statements are TRUE. Configuration errors usually show themselves before the beep after the power-on self-test (POST), or before the operating system loads. Configuration errors typically occur when you install a new server system or you add additional hardware or software.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 494-497.