单选题Which of the following commands should the administrator run to check if the SMTP services are still active？（）A Telnet Server name 25B Ping Server name C net send Server name test mailD nbtstat a Server name
单选题
Which of the following commands should the administrator run to check if the SMTP services are still active？（）
A
Telnet <Server name>
B
Ping <Server name>
C
net send
D
nbtstat a <Server name>
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