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Which among the following can be detected by an envelope detector?

Which among the following can be detected by an envelope detector? Correct Answer High frequency AM waves

An envelope detector is used to detect high-frequency amplitude modulated (AM) waves. It takes high-level AM waves as input and then provides an output that can be considered as an envelope of the original signal. An envelope detector may consist of a simple RC circuit.

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The envelope detector consists of:
A DSB-SC signal is generated using the carrier signal cos (ωct + θ) and modulating signal m(t). What is the envelope detector output of this DSB-SC signal?
AM system use only product detector for demodulation. They never use envelope detectors.
Envelope detector consists of