The vertices of a square are listed below.
Q(0,0), U(0,4), A(4,4), D(4,0)
After the square undergoes an isometric transformation, its new vertices are Q'(0,0), U'(4,0), A'(4,-4), and D'(0,-4). Which of the following options best describes the type of transformation that maps QUAD onto Q'U'A'D'?
a. reflection
b. translation
c. rotation