Which description of a figure and its image match the transformation described by (x,y) → (x, 3y)?
The figure and its image are similar and the image has been translated 3 units up.
The figure and its image are similar and the image has been translated 3 units to the right.
The figure and its image are neither similar nor congruent, and the image has been stretched horizontally.
The figure and its image are neither similar nor congruent, and the image has been stretched vertically.