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Which method from the following is used in demodulating FM wave?

Which method from the following is used in demodulating FM wave? Correct Answer Phase discrimination method

Frequency modulated (FM) signal can generally be demodulated by the following methods:

Frequency Discrimination:

Phase Discrimination:

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Phase-locked loop (PLL):

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What will be the output? interface A{ public void method(); } class One{ public void method(){ System.out.println("Class One method"); } } class Two extends One implements A{ public void method(){ System.out.println("Class Two method"); } } public class Test extends Two{ public static void main(String[] args){ A a = new Two(); a.method(); } }