The following code is supposed to return n!, for positive n.  int factorial(int n){   if (n == 0)     return 1;   else     return (n + factorial(n - 1)); } An analysis of the code using our "Three Question" approach reveals that:  Group of answer choices it fails the base-case question. it fails the smaller-caller question. it fails the general-case question. it passes on all three questions and is a valid algorithm. None of these is correct.

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