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A square is reflected across the y-axis, then translated 3 units down to form a second square. Are the two squares congruent, and why?
O They are congruent because a reflection and a translation are both rigid motions.
O They are congruent because neither a reflection nor a translation is a rigid motion.
O They are not congruent because a reflection is not a rigid motion, even though a translation is rigid.
O They are not congruent because a translation is not a rigid motion, even though a rotation is rigid.