A nurse is reading a tuberculin skin test for a client who received a purified protein derivative test 72 hr ago. Which of the following findings indicates a positive test?

A. A reddened area without induration is not a positive result. B. A reddened area without induration is not considered positive. C. An induration of 5 mm is positive only for high-risk groups (e.g., immunocompromised clients). D. An induration measuring 10 mm is considered positive in most adults, indicating TB exposure.