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What is connected between the antenna and the mixer to avoid oscillator radiation?

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What is connected between the antenna and the mixer to avoid oscillator radiation?

(a) LNA

(b) Attenuator

(c) Duplexer

(d) Power amplifier

This question was addressed to me in class test.

My question comes from Communication Receivers topic in division Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

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Best answer
The correct choice is (a) LNA

Easiest explanation: LNA or low noise amplifier is placed in between the antenna and the mixer. The oscillator signal is relatively strong and some of it can leak through and appear at the input of the mixer. The RF amplifier between the mixer and the antenna isolates the two, significantly reducing any local oscillator radiation.

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