The helicopter deck of a ship must be marked with the units identification，appropriate aiming circles，and a continuous line on the perimeter which is（）.

A.on a tug standing by
B.available by contract with the shore facility
C.kept at the shoreside hose connection during transfer
D.kept in a protected shoreside location readily accessible

A.from the water only
B.at the deck
C.by jumping down onto it
D.through the escape tube

A.lower personnel down by a transfer basket
B.lower food and water to personnel in a life raft
C.lower the life raft down with its full complement
D.move equipment around the deck