A manufacturer’s distributed storage system was put into operation for 100 days, running 24 hours a day. A failure occurred on the morning of the 10th day, and it took 1 hour to recover from the failure. A failure occurred on the morning of the 25th day. It took 4 hours to recover from the failure. A failure occurred on the morning of the 80th day, and it took 1 hour to recover from the failure. The availability of the software system is ()

A manufacturer’s distributed storage system was put into operation for 100 days, running 24 hours a day. A failure occurred on the morning of the 10th day, and it took 1 hour to recover from the failure. A failure occurred on the morning of the 25th day. It took 4 hours to recover from the failure. A failure occurred on the morning of the 80th day, and it took 1 hour to recover from the failure. The availability of the software system is ()
A . 99.25%
B . 99.75%
C . 97.25%
D . 97.75%

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Answer: B