Which phase of sound is associated with a distinct, sharp tapping sound that continues rhythmically?

Question

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In phase III, a great deal of blood is pushing down into the artery. The distinct, sharp tapping sounds return and continue rhythmically. If you do not inflate the cuff enough, you will miss the first two phases completely and you will incorrectly interpret the beginning of phase III as the systolic blood pressure (phase I).

Which Phase of Sound Is Associated with a Distinct, Sharp