You are the administrator for the Certkiller servers and your newly appointed trainee wants to know from you which of the following are valid reasons for upgrading the Certkiller servers?

A.
Normal maintenance cycle of providing company systems with up-to-date BIOS, drivers, and firmware

B.
Unplanned maintenance functions

C.
The periodic update of all company system components due to a unscheduled maintenance process

D.
The existence of a security concern that requires correction

Explanation:
The Certkiller servers should only be upgraded if you know of the existence of a security concern that requires correction and if you want to correct it.
Incorrect Answers:
A: Just upgrading BIOS, drivers and firmware because a update exists is bad as your current system might function better, what is not broken should not be updated or fixed and replaced.
B: This is a bad idea as any a number of things can go wrong if unplanned.
C: Updates or installations should never be periodically upgraded if it is unscheduled.
Reference:
Server+ Exam Cram 2 (Exam SK0-002), Charles J. Brooks, Que, November 2005, pg 294. pg 295