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

Consider the following class class ABC { int a; int b; public : constructor function }; We wish to define the constructor function using an initialization list. Which one of the following is the legal constructor function?

1. ABC (int x, int y): a (x), b(y) { }
2. ABC (int x, int y): b (x), a(x+y) { }
3. ABC (int x, int y): a (x), b(a*y) { }
4. All the above

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Answer: 

Option d: All the above

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Explanation Here