Which of the following is TRUE about the ate program？（）

• A、When running ate for the first time it will prompt for all the required information and configure all the required devices
• B、The program is used by cu to communicate to a remote system
• C、The program is used for remote communications between the host and a remote system using a modem or null modem via a tty port
• D、The program ate calls cu to communicate with the remote system