non-root user can run rsh commands from serverA to serverB， but attempts to run rsh commands by the root user return with a permission error message. What action will resolve the problem？ （）

A.Add root user to the /etc/hosts.equiv on serverb
B.Create $HOME/.rhosts file for the root user on serverb
C.Restart the rshd daemon with root enabled option on serverb
D.Add entry to allow root user from serverA to the /etc/hosts.allow on serverb