Assertion A: Large size stones are required in stone revetment in shore protection. Reason R: Resistance of stone to wave force is proportional to its volume and wave force is proportional to the exposed area of the stone. Select your answer based on the coding system given below."

Docks are for loading, unloading, and repair of ships, while harbours provide safe shelter and anchorage for ships and allow the transfer of passengers and cargo between the ship and the land.