The nurse prepares to begin a systematic assessment of a client's heart sounds. Upon positioning the stethoscope as seen in the picture, which should the nurse do first?

A. Listen for abnormal sounds. Before identifying abnormal sounds, it's essential to first establish a baseline by identifying the normal heart sounds (S1 and S2).B. Identify S1 and S2 heart sounds. This is the correct first step in a systematic assessment of heart sounds. S1 ("lub") corresponds to the closure of the atrioventricular valves (mitral and tricuspid), while S2 ("dub") corresponds to the closure of the semilunar valves (aortic and pulmonic).C. Move the stethoscope to the apical site. While the apical site is important for auscultating specific heart sounds, it's best to first identify S1 and S2 at the traditional auscultatory areas (aortic, pulmonic, tricuspid, and mitral).D. Change to the bell of the stethoscope. The bell of the stethoscope is used to listen for lower-pitched sounds, but it's not typically used for identifying S1 and S2 heart sounds, which are higher-pitched.