Normally, front-end selectivity is provided by the resonant networks both before and after the RF stage in a superheterodyne receiver. This whole section of the receiver is often referred to as the:

In a superheterodyne receiver, the resonant networks located before and after the RF amplifier stage are responsible for selecting the desired frequency band while rejecting out-of-band signals. This entire tuning and filtering section is collectively known as the preselector. The preselector is crucial because it prevents strong, unwanted out-of-band signals from reaching the mixer and overloading the receiver. It provides the initial selectivity before any frequency conversion takes place. A preamplifier merely amplifies the signal but does not inherently provide this front-end selectivity. 'Preamble' is a digital communications term, and 'pass-selector' is simply a distractor made up for this exam question.