During a routine security audit, Bob discovers that SSH keys were not added to the SSH agent with an expiration time, potentially leaving them loaded indefinitely. For improved security, he decides that keys should be automatically removed from the agent after a certain period of inactivity. What option should Bob include with ssh-add
to ensure that a key expires after 1 hour of inactivity?
ssh-add -T 3600
ssh-add -x 3600
ssh-add -t 3600
ssh-add -X 3600