Which sequences of transformations result in an image being congruent to its pre-image?
Select each correct answer.
a translation 2 units down and a 90° clockwise rotation about the origin
a reflection across the y-axis and a dilation by a scale factor of 3
a dilation by a scale factor of 0.5 and a 180° rotation about the origin
a reflection about the x-axis and a reflection about the y-axis