What is the screen output of the following fragment of C code (no explanation required)? int f1(int a, int b, int c) { b = (a + b * c); return (b-1); } int f2 (int a, int c) { int b = fl (a, a*c, c); return bta; } int main () { } printf("result is %d ", f1 (4, f2 (3,2), 6)); return 0;