Two similar polygons are shown below: A coordinate grid is shown from positive 10 to negative 10 on the x-axis and from positive 10 to negative 10 on the y-axis. A polygon P prime Q prime R prime S prime is shown with vertex P prime on ordered pair 3, 2, vertex Q prime on ordered pair 1, 2, vertex R prime on ordered pair 2, 1 and vertex S prime on ordered pair 1, 1. A polygon PQRS is shown with vertex P on ordered pair 9, 6, vertex Q on ordered pair 3, 6, vertex R on ordered pair 6, 3 and vertex S on ordered pair 3, 3.

Which set of transformations was performed on PQRS to form P′Q′R′S′?

A dilation factor of 2
A dilation factor of 1 over 3
A dilation factor of 1 over 2
A dilation factor of 3