You have been working with an ISP $($Internet Service Provider$)$ as a network engineer. You have made multiple WAN $($wide area network$)$ connections over a period. Recently, you have received complaints from various clients about network failure, which is influencing their day$-$to$-$day business. This network failure is primarily caused by some bugs in a few of the network devices. To protect your clientele, you have decided to provide an additional information sheet that will specifically state the amount of time you will take to fix the issue. Which one of the following will you use to calculate the average amount of time required to repair the faulty device?

a$.$

MTTR $($Mean Time To Repair$)$

b$.$

MTBF $($Mean Time Between Failures$)$

c$.$

CARP $($Common Address Redundancy Protocol$)$

d$.$

LACP $($Link Aggregation Control Protocol$)$