Statement 1: Rectangle ABCD is given Statement 2: AD
÷ BC because opposite sides of a rectangle are congruent
Statement 3: DC ÷ DC by the reflexive property of congruence
Statement 4: Angles ADC and BCD are both right angles by definition of a rectangle
Statement 5: Angles ADC and BCD are congruent because all right angles are congruent
Statement 6:
Statement 7: AC = BD by CPCTC
Which statement below completes Zinnia's proof (which fills in statement 6 properly) ?

A) Triangles ADC and BCD are congruent (by ASA postulate)

B) Triangles ADC and BCD are congruent (by SAS postulate)

C) Triangles ADC and BA are congruent (by ASA postulate)

D) Triangles ADC and BA are congruent (by SAS postulate)