A New IO Card Has Been Added to the Security

Multiple Choice

A new IO card has been added to the security server to log the opening and closing of the main entrance. A switch is attached, so the interface card returns a 1 when the door is opened and a 0 when the door is closed. Which of the following describes the Linux device to which this switch is attached?

A) /dev/tty0
B) /dev/port
C) /dev/gpio
D) /dev/sg0