The Nurse Is Preparing to Use a Stethoscope for Auscultation

The nurse is preparing to use a stethoscope for auscultation.Which statement is true regarding the diaphragm of the stethoscope? The diaphragm:

A) Is used to listen for high-pitched sounds.
B) Is used to listen for low-pitched sounds.
C) Should be lightly held against the person's skin to block out low-pitched sounds.
D) Should be lightly held against the person's skin to listen for extra heart sounds and murmurs.