A nurse is providing teaching to a client who has angina and a new prescription for Nitroglycerin sublingual tablets. Which of the following statements by the client indicates an understanding of the teaching?

"I'll dial 911 if I still have pain after taking 3 nitroglycerin tablets 5 minutes apart."

"I'll dial 911 if I still have pain after taking 4 nitroglycerin tablets over a 20-minute period."

"I'll dial 911 if 1 nitroglycerin tablet does not relieve my pain, and then take up to 2 more tablets 5 minutes apart while waiting."

"I'll dial 911 when I have pain and then take the nitroglycerin tablets."