Which Precaution Should You Stress When Teaching a Patient About

Which precaution should you stress when teaching a patient about a prescribed nitroglycerin transdermal patch?

A) "If a patch comes loose,tape it tightly to the skin with several layers of tape."
B) "Do not remove old patches,just let them fall off over time."
C) "Take care to apply the patches directly over your heart."
D) "Remove the old patch before applying the new patch."