When should you consider upgrading a UPS? (Choose all that apply)

A.
When the UPS no longer provides the required power to operate the specific server system in a power outage situation.

B.
After you have added additional servers to your environment.

C.
When the UPS no longer provides sufficient power to allow systems to shut down properly, with the result being corrupt/lost data.

D.
All of the above.

Explanation:
Each options details instances in which you should seriously consider upgrading a UPS device.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 431-433.