If A is the sister of C and C is the wife of D, how is D related to A?

1. C is the wife of D, so D is C's husband. 2. A is C's sister, so D is the husband of A's sister. 3. The husband of one's sister is a brother-in-law. _Source: RRB Group D CEN-02/2018 PYQ, Q.60._