Which best describes the transformation? Triangle ABC was transformed using the rule (x, y) - (y

x). The vertices of the triangles are shown.

A(-1, 1) A (-1, -1)

B (1,1) B'(-1, 1)

C (1,4) C (4,1)

The transformation was a 90° rotation about the origin.

O The transformation was a 180° rotation about the origin.

O The transformation was a 270° rotation about the origin.

O The transformation was a 360° rotation about the origin.