Final answer:
After docking, a line should be secured from the dock to the cleat of the boat.
Step-by-step explanation:
After docking, a line should be secured from the dock to the cleat of the boat. A cleat is a metal or wooden fitting on the boat that is used to fasten ropes or lines securely. By attaching a line to the cleat, the boat can be held in place and prevent it from drifting away from the dock.