Which sequence of transformations performed on shape i confirms the congruence of shape ii and shape i? a. a reflection across the y-axis and then a translation down 16 units b. a 90° counterclockwise rotation about the origin and then a translation down 8 units c. a 90° clockwise rotation about the origin and then a translation left 16 units d. a 180° rotation about the origin and then a translation left 8 units