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Which of the following completes the proof?

Given: Segment AC is perpendicular to segment BD

Prove: ∆ACB ~ ∆ECD

Reflect ∆ECD over AC. This establishes that _____. Then, _____. This establishes that <E'D'C'= <ABC. Therefore, ∆ACB ~ ∆ECD by the AA similarity postulate.

O <ABC= <E'D'C'; translate point E' to point A
O <ACB= <E'C'D', translate point E' to point B
O <ACB= <E'C'D'; translate point D' to point B
O <ABC= <E'D'C'; translate point D' to point A​

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