The ufw (Uncomplicated Firewall) delete command is used to remove rules.
If the original rule was ufw deny 80/tcp, it must be deleted with:ufw delete deny 80/tcp If the original rule was ufw deny 80/tcp, it must be deleted with:ufw delete deny 80/tcp If the original rule was ufw deny 80/tcp, it must be deleted with:ufw delete deny 80/tcp Why the other options are incorrect?
A: ufw delete 80/tcp # Incorrect, because delete requires specifying the action (allow or deny).
C: ufw delete 80/tcp deny # Incorrect syntax; deny must come before the port.
D: delete7! # Incorrect, this is not a valid ufw command.
References:
UFW Documentation - Ubuntu