The Chief Technology Officer (CTO) of a company, Ann, is putting together a hardware budget for the next 10
years. She is asking for the average lifespan of each hardware device so that she is able to calculate when she
will have to replace each device. Which of the following categories BEST describes what she is looking for?

A.
ALE

B.
MTTR

C.
MTBF

D.
MTTF

Explanation:
MTTF stands for Mean Time To Failure