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

The following examples show that the class C is derived from classes A and B. Which one of them is legal?

1. class C : private A, public B
2. class C :: private A, public B
3. class C : public A : public B
4. class C: private A, public B;

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Answer: 

Option a: class C : private A, public B

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Explanation Here