Two similar polygons are shown below: A coordinate grid is shown from positive 6 to negative 6 on the x-axis and from positive 6 to negative 6 on the y-axis. A polygon P prime Q prime R prime S prime is shown with vertex P prime on ordered pair 2, negative 4, vertex Q prime on ordered pair 6, negative 4, vertex R prime on ordered pair 4, negative 2 and vertex S prime on ordered pair 2, negative 2. A polygon PQRS is shown with vertex P on ordered pair 1, negative 2, vertex Q on ordered pair 3, negative 2, vertex R on ordered pair 2, negative 1 and vertex S on ordered pair 1, negative 1. Which transformation was performed on PQRS to form P′Q′R′S′?