During the Physical Examination, the Nurse Notices That a Female

During the physical examination, the nurse notices that a female patient has an inverted left nipple. Which statement regarding this is most accurate?

A) Normal nipple inversion is usually bilateral.
B) Unilateral inversion of a nipple is always a serious sign.
C) Whether the inversion is a recent change should be determined.
D) Nipple inversion is not significant unless accompanied by an underlying palpable mass.