甲软件系统每年因故障中断10次，每次恢复平均要20分钟，乙软件系统每年因故障中断2次，每次恢复平均要5个小时。根据《软件工程产品质量GB/T16260-2006》中可靠性和有有效性（或可用性）的定义，下面说法正确的是（ ）。
- A.甲系统的可靠性比乙系统高，可用性比乙系统差
- B.甲系统的可用性比乙系统高，可靠性比乙系统差
- C.甲系统的可靠性比乙系统高，可用性比乙系统高
- D.甲系统的可靠性比乙系统差，可用性比乙系统差
正确答案及解析
正确答案
解析
故障次数反映可靠性，故障恢复时间反映可用性。
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