Triangle ABC was transformed using the rule (x, y) → (–y, x). The vertices of the triangles are shown.A (–1, 1)B (1, 1)C (1, 4) A' (–1, –1)B' (–1, 1)C' (–4, 1)
A
The transformation was a 90° rotation about the origin.B
The transformation was a 180° rotation about the origin.C
The transformation was a 270° rotation about the origin.D
The transformation was a 360° rotation about the origin.