单项选择题

A.User ’joe’ is specified in the etc nologin on SYSTEMb……

A banking user with the userid of ’joe’ is unable to rsh from SYSTEMA to SYSTEMB without having to retype their password， but they can rsh from SYSTEMB to SYSTEMA. No other users are experiencing the same issue.
Both systems have a /home/joe/.rhosts file that contain the proper references to the other host. The /home/joe/.rhosts files on both SYSTEMA and SYSTEMB are owned by userid ’joe’.
Which of the following is the most likely cause of this problem（）

A.User ’joe’ is specified in the /etc/nologin on SYSTEMb.
B.User ’joe’ is specified in the /etc/nologin on SYSTEMa.
C.The file permissions on the /home/joe/.rhosts file on SYSTEMA are incorrect.
D.The file permissions on the /home/joe/.rhosts file on SYSTEMB are incorrect.

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