C++ MQCs with Explanation (CHAPTER : INHERITANCE : EXTENDING CLASSES

Consider the following code: class A { }; class B : A { }; What happens when we compile this code?

1. Will not compile because the body of A is empty
2. Will not compile because the body of B is empty
3. Will not compile because the visibility mode for A is not specified
4. Will compile successfully

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Answer: 

Option d: Will compile successfully

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Explanation Here