What rotation was applied to triangle DEF to create triangle D'E'F'?

d = (-1, 6)

e = (1, 3)

f = (6, 3)

d' = (1, - 6)

e' = (-1, - 3)

f' = (-6, - 3)

Possible answers:

90° clockwise

180°

None of the above

90° counterclockwise

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