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Which of the following is not present in the conversion stages of super heterodyne receiver?

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Which of the following is not present in the conversion stages of super heterodyne receiver?

(a) Local oscillator

(b) Additional filter

(c) Step attenuator

(d) Amplifier

I got this question during an interview.

My doubt stems from RF and IF Processing Tradeoffs in chapter Technology Tradeoffs in Software Defined Radio of Cognitive Radio

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The correct choice is (c) Step attenuator

The explanation is: Each conversion stage of super heterodyne receiver has one LO, additional filters and amplifiers. Step attenuator is present after the pre-selector filters. It confines the total power at the input of first conversion stage within its linear range.

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