Why is it that if you have an abstract class like Shape you are allowed to define a reference variable of type Shape but not allowed to new an actual Object of type Shape? A: Because the definition of the type itself is incomplete, like a blueprint for a house being incomplete and thus you can't build one. B: All refences variable are of the same size so no specific information about how much memory is needed to define a reference is needed for any type. C: Both A & B are true OB