When teaching how to use nitroglycerin, the nurse tells the client to place 1 tablet under the tongue when pain occurs and to repeat the dose in 5 minutes if pain persists. The nurse should also tell the client to

D place 1 tablet under the tongue when pain occurs and use an additional tablet after the attack to prevent recurrence. A place 2 tablets under the tongue when intense pain occurs. C place 1 tablet under the tongue 3 minutes before activity and repeat the dose in 5 minutes if pain occurs. B swallow 1 tablet and place under the tongue when pain is intense.