According to the Nyquist theorem to produce the original analog signal, one necessary condition is :

1. ASampling rate must be at least 2 times the highest frequency contained in the signal
2. BSampling rate must be at least 2 times the lowest frequency contained in the signal 1
3. CSampling rate must be at least times the 2 highest frequency contained in the signal 1
4. DSampling rate must be at least times the 2 lowest frequency contained in the signal

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Show answer & explanation

Correct answer: A. Sampling rate must be at least 2 times the highest frequency contained in the signal

Explanation

To reconstruct an analog signal, sample at least twice its highest frequency component.