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

A. The ointment should be spread in a thin, even layer on a hairless area (e.g., chest, upper arm) using the applicator to ensure consistent absorption. B. The ointment should not be massaged, as this can alter absorption rate and cause hypotension. C. Application sites should be rotated to prevent irritation; the forearm is not optimal due to thinner skin. D. The prescription schedule depends on provider instructions, typically every 6–12 hours with a nitrate-free period to prevent tolerance.