【单选题】
A One which directly supports the business processes of customers直接?持客户的业务流程
B A service that cannot be allowed to fail 不允许失败的服务
C One which is not covered by a service level agreement 未涵盖在服务?平协议的服务
D A service not directly used by the business 不能被业务直接使?的服务
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