Kim performed a transformation on triangle ABC to create triangle A'B'C', as shown in the figure below: Triangles ABC and A prime B prime C prime are shown. A is at 5, 4. B is at 6, 9. C is at 2, 8. A prime is at 5, negative 4. B p

What transformation did Kim perform to create triangle A'B'C'? (5 points)

Reflection across the x‐axis
Rotation of 270 degrees counterclockwise about the origin
Reflection across the y‐axis
Rotation of 90 degrees counterclockwise about the origin