Which transformations had to occur for the blue triangle to become the purple triangle? [note: all rotations are about origin] a) rotated 180° then translated down 3 units and left 2 units b) reflected over x-axis and then rotated 90° clockwise c) translated down two units and rotated 90° counter-clockwise d) rotated 90° clockwise then translated down 3 units and left 2 units