Which of the Following Statements Is Completely True

Multiple Choice

Which of the following statements is completely True?

A) If a class is declared to be abstract then every method in the class is abstract and must be overridden
B) If a class is declared to be abstract then some methods in the class may have their bodies omitted
C) If a class is declared to be abstract then all methods in the class must have their bodies omitted
D) If a class is declared to be abstract then all the instance variables must be overridden when a concrete class is derived from the abstract base class