What command is used to hang up a MODEM when using the “AT Command set”? A. ATZ B. ATD C. ATR D. ATH E. None of the above

The correct answer is: D. ATH

The AT command set is a standard set of commands used to control modems. The ATH command is used to hang up a modem.

The ATZ command is used to reset a modem. The ATD command is used to dial a phone number. The ATR command is used to get the modem’s response code.

None of the other options are correct.