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Fill in the blank

ABCDEFGH is a regular octagon. The minimum degree of rotation by which this octagon can map onto itself is _°. It will take _ increments of that degree of clockwise rotation for A′ (the image of A) to coincide with C.

First blank answers choices are 30, 45, 90, or 120

Second blank answer choices are 2, 4, 6, or 8

Thank you