单选

某软件系统投入运行10天,计划运行时间为每早8点至晚6点。第二天上午发生一次失效,故障恢复用了1小时。第4天上午发生一次失效,故障恢复用了4小时。第9天上午发生一次失效,故障恢复用了1小时。根据《软件工程产品质量GB/16260-2006》,该软件系统的有效性(或可用性,availability)为()。

  • A.98%
  • B.95%
  • C.80%
  • D.94%
参考答案
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