Fill in the missing reasons for the following two-column proof for the following information. Given: B is the midpoint of segment AC; C is the midpoint of segment BC

Prove: AB = CD
Statement Reason
B is the midpoint of segment AC; C is the midpoint of segment BC 1.?
AB = BC; BC = CD 2.?
AB = CD 3.?
1. Given; 2. Definition of Midpoint; 3. Transitive Property
1. Given; 2. Definition of Congruence; 3. Transitive Property
1. Given; 2. Definition of Midpoint; 3. Definition of Congruence
1. Given; 2. Definition of Congruence; 3. Definition of Midpoint