Which is the missing step in the proof below? Given: ABCD is a parallelogram. ACED is a parallelogram.

Prove: △ABC≅△DCE
STATEMENTS REASONS
1. ABCD is a parallelogram. ACED is a parallelogram.

1. Given
2. AB¯¯¯¯¯¯¯¯≅DC¯¯¯¯¯¯¯¯; BC¯¯¯¯¯¯¯¯≅AD¯¯¯¯¯¯¯¯;

CE¯¯¯¯¯¯¯¯≅AD¯¯¯¯¯¯¯¯; CA¯¯¯¯¯¯¯¯≅ED¯¯¯¯¯¯¯¯ 2. Parallelogram Opposite Sides Theorem
3. BC¯¯¯¯¯¯¯¯≅CE¯¯¯¯¯¯¯¯ 3. Transitive Property of Congruence
4. 4.

△ABC≅△DCE by the SAS Congruence Theorem

△ABC≅△DCE by the ASA Congruence Theorem

△ABC≅△DCE by the SSS Congruence Theorem

△ABC≅△DCE by the HL Congruence Theorem