Question

Quadrilateral ABCD underwent a sequence of transformations to give quadrilateral A′B′C′D′. Which transformations could not have taken place?

a reflection across the line y = x followed by a reflection across the line y = -x

a reflection across the x-axis followed by a reflection across the y-axis

a rotation 180° clockwise about the origin followed by a reflection across the line y = x

a reflection across the y-axis followed by a reflection across the x-axis
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