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Which of the following actions is required to establish passwordless SSH authentication?
Correct Answer: D
To set up passwordless SSH authentication, the public key from the client must be added to the ~/.ssh /authorized_keys file on the remote server. * Private keys must never be copied to another machine. * Option B is insecure; option C is unnecessary unless the remote server needs key-based login itself. Reference:CompTIA Linux+ XK0-005 Study Guide, Domain 3.0 - Security "Copy the public key (usually via ssh-copy-id) to the remote system's ~/.ssh/authorized_keys file to enable key-based authentication."