单项选择题

In the following essay,each blank has four choices.Choose the most suitable onefrom the follow choices and write down in the answer sheet.
Open Shorest Path First(OSPF)is a 25 routing algorithm that 26 work doneon the OSI IS.IS intradomain routing protocol.This routing, as compared to distance-vectorrouting,requires 27 processing power.The 28 algorithm is used to calculate routes.OSPF routing table updates only take place when necessary, 29 at regular intervals.
供选择的答案网络中某用户只能接收但不能发送Email,此时管理员应检查

A.Email服务器是否与网络连通
B.连接客户端与Email服务器之间的路由器端口的访问控制列表是否进行了deny SMTP设置
C.连接客户端与Email服务器之间的路由器端口的访问控制列表是否进行了deny any设置
D.连接客户端与Email服务器之间的路由器端9的访问控制列表是否进行了deny pop3设置
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