Triangles DEF and D'E'F' are shown on the coordinate plane below

Triangles DEF and D’E’F’ are shown on the coordinate plane below. Triangle DEF and triangle D prime E prime F prime with ordered pairs at D negative 1, 6, at E 1, 3, at F 6, 3, at D prime 1, negative 6, at E prime negative 1, negative 3, at F prime negative 6, negative 3.
What rotation was applied to triangle DEF to create triangle D’E’F’?.

A.90° clockwise.
B.180°.
C.None of the above.
D.90° counterclockwise