When would it be the best opportunity to upgrade the system BIOS?

A.
Installing a compatible Hard drive

B.
Installing a compatible RAID controller

C.
Installing a compatible processor

D.
A processor upgrade

Explanation:
The server mother board usually comes with a multiprocessor BIOS that can handle compatible processors, but if you replace the processors with newer faster processors this would be the ideal time to upgrade your BIOS.
Incorrect
Answers:
A: This would be detected and would have been put in use already and does not require a BIOS upgrade.
B: This would be detected and would have been put in use already and does not require a BIOS upgrade.
C: This would be detected and would have been put in use already and does not require a BIOS upgrade.
Reference:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 381.