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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Aphrase is shown read the phrase and give me the answer