What does the following program do? #include unsigned int mystery(unsigned int a, unsigned int b); // function prototype int main(void) printf("%s", "Enter two positive integers: "); unsigned int x; / / first integer unsigned int y ; / / second integer scanf ("\%u\%u", \&x, \&y); } printf("The result is \% in ^{\prime \prime}, mystery \left.(x, y)\right); / / Parameter b must be a positive integer / / to prevent infinite recursion unsigned int mystery(unsigned int a, unsigned int b) f // base

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