The Superheterodyne Receiver Design Is Superior to the TRF Design

Multiple Choice

The superheterodyne receiver design is superior to the TRF design:

A) since it uses many RF amplifier stages before the RF signal is mixed with the local oscillator signal.
B) since it allows for a constant selectivity over the entire tuning range of the receiver.
C) since it always uses synchronous detectors instead of diode detectors.
D) all of the above