When auscultating a client's heart sounds, the nurse hears a louder S2 when listening at the 2nd intercostal space right sternal border. The nurse determines that this finding is consistent with the closure of which heart valves?

A. Pulmonic and tricuspid: The tricuspid valve's closure is not primarily audible at the 2nd intercostal space right sternal border; it is better heard at the lower left sternal border. B. Mitral and aortic: The mitral valve is best heard at the apex of the heart, not the 2nd intercostal space right sternal border. C. Aortic and pulmonic: The 2nd intercostal space right sternal border is the area where the aortic and pulmonic valves are auscultated. The louder S2 here indicates the closure of these valves, with the aortic valve being the primary source of sound in this area. D. Tricuspid and mitral: These valves are best heard at other locations, with the tricuspid valve near the lower left sternal border and the mitral valve at the apex.