Which of the following option with reference to UNIX operating system is not correct? (A) INT signal is sent by the terminal driver when one types and it is a request to terminate the current operation. (B) TERM is a request to terminate execution completely. The receiving process will clean up its state and exit. (C) QUIT is similar to TERM, except that it defaults to producing a core dump if not caught. (D) KILL is a blockable signal.