Question 20 Give the output for the following code. int main (void) ( int pid; printf("1"); fflush (stdout); pid - fork ) if (pid !- 0) f sleep (20) printf ("2"); fflush (stdout) pid-fork) if (pid !- 0) ( sleep (50)printf ("3"); fflush (stdout) else f sleep (20) printf ("4"); fflush (stdout); else sleep (50) printf ("5"); fflush (stdout); printf("6"); fflush (stdout)