Virtual functions allow you to

A、createanarrayoftypepointer-to-baseclassthatcanholdpointerstoderivedclasses.
B、createfunctionsthatcanneverbeaccessed.
C、groupobjectsofdifferentclassessotheycanallbeaccessedbythesamefunctioncode.
D、usethesamefunctioncalltoexecutememberfunctionsofobjectsfromdifferentclasses.