【单选题】
A Any change of state that has significance for the management of a configuration item (CI) or IT service任何对配置项( CI)或IT服务管理具有重要的意义的状态变化
B An unplanned interruption to an IT service or a reduction in the quality of an IT serviceIT服务的意外中断或质量下降
C The unknown cause of one or more incidents that have an impact on an IT service对IT服务产?影响的?个或多个事故的未知原因
D Reducing or eliminating the cause of an incident or problem减少或消除事故或问题的原因
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