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What type of signal does the analogWrite() method generate when a pin is set to OUTPUT mode?

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What type of signal does the analogWrite() method generate when a pin is set to OUTPUT mode?

(a) Digital Signal

(b) Pulse Code Modulated Signal

(c) Pulse amplitude Modulated Signal

(d) Pulse Width Modulated Signal

I have been asked this question in examination.

Enquiry is from Setting Pin Mode topic in chapter Arduino Programming of Arduino

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Correct answer is (d) Pulse Width Modulated Signal

The best I can explain: The analogWrite() method in Arduino is used to generate a Pulse Width Modulated Signal since the digital circuitry in the Arduino does not allow for generation of true continuous analog waves. So therefore, the PWM Signal is used.

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