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How many steps are there in QRS detection?

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How many steps are there in QRS detection?

(a) Three steps

(b) Two steps

(c) Four steps

(d) One step

The question was posed to me in quiz.

This intriguing question comes from Phonocardiography (PCG) topic in portion Biomedical Recorders of Biomedical Instrumentation

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The correct answer is (b) Two steps

Easiest explanation: QRS detection is now almost universally performed digitally in a two-step process. The ECG is first preprocessed to enhance the QRS complex while suppressing noise, artifact and non-QRS portions of the ECG. The output of the preprocessor stage is subjected to a decision rule that confirms the detection of QRS if the processor output exceeds a threshold.

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