Ben performed a transformation on trapezoid PQRS to create P'Q'R'S, as shown in the figure below.
P
S
R
P
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R₁
What transformation did Ben perform to create P'Q'R'S'?
O Rotation of 270 counterclockwise about the origin
O Reflection across the line of symmetry of the figure
O Reflection across the y-axis
O Rotation of 90 counterclockwise about the origin