Which of the following lines in the sshd configuration file should, if present, be changed in order to increase the security of the server? (Choose two.)

Which of the following lines in the sshd configuration file should, if present, be changed in order to increase the security of the server? (Choose two.)
A . Protocol 2, 1
B . PermitEmptyPasswords no
C . Port 22
D . PermitRootLogin yes
E . IgnoreRhosts yes

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Answer: A,D