On a coordinate plane, triangle R S T has points (0, 1), (negative 2, 2), (negative 1, 4). Triangle R prime S prime T prime has points (1, 0), (2, 2), (4, 1).
Which rotation, using the origin as the center of rotation, transformed RST to R’S’T’?
a 90° clockwise rotation
a 90° counterclockwise rotation
a 45° clockwise rotation
a 45° counterclockwise rotation