(1) What is the screen output of the following C program (no explanation required)? #include int f1 (int a, int b, int c) { return (a+b*c); } int f2 (int a, int b) { } int { } int cf1 (a, b, 3); return c+1; main (void) printf ("result is %d ", f1 (-1 , f2 (2,4),2)); return 0;