4. (7 pts) Consider the following C program that manipulates newly created file named foo.txt. Write the contents of foo.txt after its execution. == int main(int argc, char *argv[]) { close(STDOUT_FILENO); int f = open("foo.txt", O_CREAT|O_WRONLY|O_TRUNC, S_IRWXU); assert (f >= 0); int rt = fork(); if (rt 0) { write(f, "Child here! , 20); printf("Child terminates. "); } else if ( rt > 0) { (void) wait(NULL); write(f, Parent here! , 21); printf("Parent terminates. ); } return 0; }