What is the MTTR of Port 4?

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An Ethernet switch has eight ports and all ports must be operational for 24 hours, from Monday through Friday.

However, a failure of Port4 occurs as follows:

– Monday = 8 PM to 9 PM

– Wednesday 7 PM to 9 PM

– Thursday = 6 AM to 9 AM

– Saturday = 4 PM to 7 PM

What is the MTTR of Port 4?
A . 2 hours
B . 3 hours
C . 28 hours
D . 38 hours