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

Which of the following statements is TRUE about virtual functions?

1. A constructor cannot be a virtual function
2. A virtual function in the base class must be defined, eventhough it may not be used
3. They cannot be declared static
4. All the above

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Answer: 

Option d:All the above

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Explanation Here