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Which of the following properties are preserved in affine transformation?

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Which of the following properties are preserved in affine transformation?

(a) co-linearity

(b) convexity

(c) concavity

(d) parallelism

I had been asked this question in semester exam.

My enquiry is from Transformations between Coordinate Systems and Affine Transformations in division 2D Transformation and Viewing of Computer Graphics

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The correct answer is (c) concavity

For explanation I would say: The col-linearity, convexity and parallelism of bunch of points are conserved in affine transformations but any 3 or more points which are concave can turn parallel, so we can say concavity is not conserved.

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