Option A is wrong. For example.
##
halof:~ # tree /etc/ssh
/etc/ssh
โโโ moduli
โโโ ssh_config
โโโ ssh_host_dsa_key
โโโ ssh_host_dsa_key.pub
โโโ ssh_host_ecdsa_key
โโโ ssh_host_ecdsa_key.pub
โโโ ssh_host_ed25519_key
โโโ ssh_host_ed25519_key.pub
โโโ ssh_host_rsa_key
โโโ ssh_host_rsa_key.pub
โโโ sshd_config
0 directories, 11 files
##
Option B is an answer. The private key must be not readable by anyone except the owner and root. Otherwise, SSH will throw a warning.
Option C is wrong. Only one public key is paired with one private key. Both of them are generated at the same time by their owner via SSH-gen.
Option D is correct. As explained above.
Option E is wrong. The public key should be copied to the remote SSH server. The private key must be kept private.
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