Last option. The sequence that can be used to to get the figure A'B'C'D' is Reflection about the y-axis followed by a translation to the right by 1 unit.
We have an opposite orientation in this question. This based on the fact that (ABCD)' is counterclockwise. While its reflection ABCD is clockwise.
The reflection has to go over a vertical line given that (CD)' and CD are at the bottom. Hence this reflection has to go over a vertical line.
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