A Linux systems administrator is setting up SSH access with PKI for several using their newly created RSA keys. Which of the following MOST securely achieves this task? 

Answer options:

A. Use curl to copy each user`s public key file to the respective system
B. Use cp to copy each user`s public key file to the respective system
C. Use ssh-copy-id to copy each user`s public key file to the respective system
D. Use ssh-copy-id to copy each user`s private key file to the respective system

C

Reference: https://www.linode.com/docs/security/authentication/use-public-key-authentication-with-ssh/