C++ MQCs with Explanation (CHAPTER : POINTERS, VIRTUAL FUNCTIONS AND POLYMORPHISM )

Which of the following statements is TRUE?

1. All virtual functions in an abstract base class must be declared as pure virtual functions
2. A class is made abstract by declaring it virtual
3. If a base class declares a pure virtual function, all derived classes must define the function
4. A derived class cannot contain a pure virtual function

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Answer: 

Option c: If a base class declares a pure virtual function, all derived classes must define the function

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Explanation Here