Consider the following definition of the recursive function mystery.int mystery(int first, int last){  if (first > last)     return 0;  else if (first == last)     return first;  else     return first + mystery(first + 1, last - 1);}What is the output of the following statement?cout

A. 13
B. 21
C. 40
D. 42

Answer: B

Computer Science & Information Technology

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