What does the floowing program do? I Finclude 2 3 unsigned int mystery(unsigned int a, unsigned int b); // function prototype 4 5 int main(void) 6 ( 7 printf("ss", "Enter two positive integers: "); uns igned int x; // first integer uns igned int y: // second integer scanf ("Nusu", &x. &y): 10 printf("The result is Su\n", mystery(x, y)); 12 13 14 15 // Parameter b must be a positive integer 16 // to prevent infinite recursion 17 uns igned int mystery(unsigned int a, unsigned int b) 18 19 20 21 22 23 // base case if (1 -- b) { return a; else { // recursive step return a + mystery(a, b 1): 24 25 26