Which SSH command allows you to remove an ID from an agent session?

The option that allows you to remove an ID from an agent session is ssh-add. This command interacts with the SSH agent to manage the identities (private keys) that are added to the agent for authentication purposes. When you want to remove a specific identity that has been added to the SSH agent, you use the ssh-add command followed by the option to remove it. For instance, executing ssh-add -d followed by the path of the identity file will effectively remove that specific key from the agent's session.

The other commands serve different purposes. For example, ssh-keygen is primarily used for generating new SSH keys, not managing them once they are in use. The ssh-agent creates and manages the SSH agent session but does not handle the removal of keys itself. Lastly, ssh-remove is not a standard SSH command and does not exist in typical SSH toolsets. Thus, ssh-add is clearly the correct choice for managing identities within an SSH agent session.