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∆ABC was transformed according to the rule (x, y) → (−x, y) to create ∆A'B'C'. What transformation justifies the relationship between the triangles?

-A translation 1 unit to the left and 1 unit upward justifies ∆ABC ~ ∆A'B'C'.

-A reflection over the y-axis justifies ∆ABC ≅ ∆A'B'C'.

-A rotation of 90° clockwise justifies ∆ABC ~ ∆A'B'C'.

-A rotation of 90° counterclockwise justifies ∆ABC ≅ ∆A'B'C'.