A nurse is providing teaching to a client who has angina and a new prescription for sublingual nitroglycerin tablets.Which of the following instructions should the nurse include in the teaching?

Choice A rationaleRepeating sublingual nitroglycerin more than three times without relief is not recommended due to the risk of severe hypotension. Medical intervention is necessary if pain persists after three doses.Choice B rationaleStoring nitroglycerin tablets at room temperature is incorrect because they should be stored in a cool, dry place and protected from light and moisture to maintain their efficacy.Choice C rationaleTaking two tablets at once increases the risk of hypotension and other side effects. It is advised to take one tablet and wait for relief before considering additional doses if necessary.Choice D rationaleTaking nitroglycerin two hours before exercise is unnecessary and not recommended. The medication should be taken at the onset of angina symptoms for the most effective relief.