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What mode should we put the Arduino pin to, in order for object detection to work with the Ultrasonic Sensor?

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What mode should we put the Arduino pin to, in order for object detection to work with the Ultrasonic Sensor?

(a) Analog

(b) Digital

(c) PCM

(d) TDM

I got this question during an interview.

Asked question is from Ultrasonic Sensor in chapter Interfacing of Sensors, Actuators, and Other Modules of Arduino

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The correct choice is (b) Digital

Explanation: The TRIGGER pin is to be kept HIGH for a period of 10 microseconds meanwhile the ECHO pin is HIGH for the time period it takes for the sent Ultrasonic wave to return to the sensor. Thus, the entire detection is digital.

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