Triangle TUV is rotated as shown on the coordinate grid below, using the origin as the center of rotation.

On a coordinate plane, triangle T U V has points (1, negative 2), (7, negative 2), (3, negative 3). Triangle T prime U prime V prime has points (2, negative 0.5), (6.2, 3.8), (4, 0).

Which describes the rotation that took place?
a 45° clockwise rotation
a 45° counterclockwise rotation
a 90° clockwise rotation
a 90° counterclockwise rotation