Which one is the key thing in backtracking? Insertion Submission Recursion Question 2 1 pts What does the following function do? int fun(int x, int y ) \{ if (y==0) return 0 ; return (x+fun(x,y1)); \} xy x+xy x+y xy Where is the recursion stored in Memory? Heap memory Both of the above None of the above Stack memory Question 4 1 pts Predict output of following program \#include int fun(int n ) \{ if (n=4) return n; else return 2 fun (n+1); \} int main() \{ printf("\%d ", fun(2)); return 0 ; \} Runtime Error 16 4 8