You Are Listening Carefully for S2 Splitting

You are listening carefully for S2 splitting. Which of the following will help?

A) Using the diaphragm with light pressure over the 2nd right intercostal space
B) Using the bell with light pressure over the 2nd left intercostal space
C) Using the diaphragm with firm pressure over the apex
D) Using the bell with firm pressure over the lower left sternal border