After a young adult woman describes feeling palpitations when she lies on her left side, it is most important for the nurse to auscultate heart sounds at which anatomical location?

Apex of the heart at left fifth intercostal space at the midclavicular line.

Base of the heart at second intercostal space, right of the sternal border.

Left third intercostal space, left lateral sternal border.

Second intercostal space, left of the sternal border.