问题:
A . The user "jsmith" can use r-commands from any server to server Alpha system-wide
B . The user "jsmith" can use r-commands from server Alpha to any server system-wide
C . The user "jsmith" can use r-commands from server Alpha to any server with a /home/jsmith directory
D . The user "jsmith" can use r-commands from any server to server Alpha only in the /home/jsmith directory
● 参考解析
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