Which of the following is used to make an abstract class?

1.	Which of the following is used to make an abstract class?
A.	Declaring it abstract using static keyword.
B.	Declaring it abstract using virtual keyword.
C.	Making at least one member function as virtual function.
D.	Making at least one member function as pure virtual function.
Answer» E.

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Which of the following is used to make an abstract class?

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