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Which port on any Arduino board should be connected to the Key Port on the Adafruit FONA 3G+GPS Breakout?

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Which port on any Arduino board should be connected to the Key Port on the Adafruit FONA 3G+GPS Breakout?

(a) Any Digital Pin

(b) Vcc

(c) Gnd

(d) Any Analog Pin

This question was posed to me during an interview.

My question is from Adafruit FONA 3G+GPS Breakout topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino

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The correct choice is (c) Gnd

The explanation: The  Adafruit FONA 3G+GPS Breakout’s Key pin should be always connected to the Gnd Pin on any Arduino Board. This pin provides the function of the power on/off indicator. When you would like to shutdown the board, connect the pin to the Gnd of the Arduino Board for about 3 to 5 seconds. However for prolonged use usage of the  Adafruit FONA 3G+GPS Breakout one needs to permanently connect this pin to the Gnd of the Arduino.

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