9) Cooperating processes cannot use to communicate. A) shared memory B) message passing C) global variables in the C program D) pipes 10) Which of the following statements about the parent process and child process is correct? A) In UNIX, fork ( ) creates a new process, which duplicates the same pid of the parent process. B) Parent process and children processes have different process control blocks. C) Parent process can create children processes but cannot terminate its children process. D) If the parent process is terminated without invoking wait ( ), the child process becomes a zombie process