题目内容

监视器向代理发出请求,询问它所需要的信息值,代理响应监视器的请求,从它所保存的管理信息库中取出请求的值,返回给监视器。这种通信机制叫作( )。

A. 轮询
B. 事件报告
C. 请求
D. 响应

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