When Auscultating an Apical Pulse of a Child, the Diaphragm

When auscultating an apical pulse of a child, the diaphragm of the stethoscope should be placed over the apex of the heart. The apex is located at:

A) The 2nd intercostal space at the midclavicular line.
B) The 4th or 5th intercostal space at the left midclavicular line.
C) The 3rd intercostal space at the left sternal border.
D) The 2nd intercostal space at the right sternal border.