Which set of transformations have been performed on triangle ABC to form triangle A′B′C′? (1 point) a Dilation by a scale factor of 2 followed by reflection about the x-axis b Dilation by a scale factor of 3 followed by reflection about the x-axis c Dilation by a scale factor of 2 followed by reflection about the y-axis d Dilation by a scale factor of 3 followed by reflection about the y-axis