单项选择题

Which of the following local files is used to run the date command on the remote machine "Earth" using the following rexec command without request for a password？ rexec Earth date（）。

A.~/ .rhosts
B.$HOME/.netrc
C./etc/hosts.equiv
D./etc/security/user

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All of the following commands could be used to verify availability of tty devices on the system EXCEPT：（）。

A.lstty
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