Which of the following categories BEST describes what she is looking for?

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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

Answer: D