By definition，a spar deck is the（）.

A.lower most continuous deck not broken by water tight bulkheads

B.after most weather deck above the main strength deck

C.upper or weather deck above the main strength deck

D.deck of light construction below the main or strength deck

先履行合同一方行使的抗辩权是( )。

A．同时履行抗辩权

B．异时履行抗辩权

C．不安抗辩权

D．后履行抗辩权