A client with coronary artery disease and stable angina is being discharged home on sublingual nitroglycerin (NTG). The nurse has completed discharge teaching related to this medication. Which statement by the client indicates that the teaching has been effective? A. I can keep a few pills in a plastic bag in my pocket in case I need them while I'm out. B. I can still take this with my vardenafil prescription. C. I can take up to 3 pills in a 15-minute period if I am experiencing chest pain. D. I should stop taking the pills if I experience a headache.