When examining the system’s boot process and you encounter errors before the beep after the power-on self-test (POST), or before the operating system loads, which type of error has been encountered? Choose all that apply.

A.
Hardware errors.

B.
Software operating system errors.

C.
Configuration errors.

D.
All of the above.

Explanation:
Hardware and 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 and add additional hardware or software. Remember that the BIOS and the basic system hardware are activated before the beep following the POST.
Incorrect
Answers:
B: The operating system and controlling software are activated after the beep noise.
D: Only Options A and C are correct.

References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 494-497.