在C#中，已知存在一个接口ICust,关于该接口的实现，下述代码正确的是（)。interfaceICust{intAddCust);voidModiyCust0;}

A.classCustService:ICustpublicintAddCust)/....}....}}

B.classCustService:ICustpublicintAddCust()....}publicvoidModiyCust0{/...}}

C.classCustServiceICust{publicoverrideintAddCust(){....publicoverridevoldModlyCust(){/...

D.classCustService:ICust{publicvoidAddCust(){.....}