Which of the following commands should a system administrator use to configure a passwordless login to remote system? (Select TWO.)

`cp` is a general file copying command but does not automate the specific process of setting up SSH keys for passwordless login on a remote system. D: `ssh-keygen` is used to *generate* the SSH key pair, but it does not directly *configure* the passwordless login on the remote system or manage the keys for convenience. E: `ssh-add` is used to add private keys to the `ssh-agent`, but `ssh-agent` itself (the program running in the background) is the primary component enabling the passphrase-less operation. F: `openssl` is a general-purpose cryptography toolkit and is not directly used for configuring passwordless SSH login in this context.

`ssh-agent` is a program that runs in the background to hold private keys, allowing users to use their SSH keys for authentication without re-entering the passphrase for each connection. C: `ssh-copy-id` is a utility that automates the process of copying local public keys to a remote host's `~/.ssh/authorized_keys` file, which is crucial for configuring passwordless login.