C++ MQCs with Explanation (CHAPTER 4: FUNCTIONS IN C++)

Which one of the following statements is a valid main function prototype?

1. void main ( );
2. int main (int a, int b)
3. main (int argc, char argv);
4. int main(int argc, char* argv[ ]);

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Answer: 

Option d:int main(int argc, char* argv[ ]);

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Explanation Here