Lingerie Closet, a women's clothing store, employs female attendants to assist customers in the dressing rooms. Mark, a forty-one-year-old male, applies for an attendant's job, but is not hired. In Mark's suit against Lingerie Closet for employment discrimination under Title VII, the store has

a. ​no defense.
​b. a bona fide occupational qualification defense.
​c. a business necessity defense.
​d. a seniority system defense.