For the following program, (1) sketch the corresponding process tree being sure to indicate any outputs and synchronization points, if they exist and (2) write down the output it will produce when executed. int done = 0; void handler (int sig) { printf ("0"); done = 1; } main() { } pid_t pid; int status; signal (SIGUSR1, handler); if ((pid = fork()) EB 0) { while (!done) ; printf("1"); exit (2) ; } else { printf("3"); kill (pid, SIGUSR1); if (wait (&status) > 0) printf ("%d", WEXITSTATUS (status)); } if (done) printf("4"); else printf("5");