Whether cavalier projection is a parallel projection, Computer Graphics

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State whether the following statements are true or false. Give reasons/examples to justify your answer.

a) Cavalier projection is a parallel projection.

b) Angles are not preserved in perspective projection in general.

c) Perspective projection is an affine transformation.

d) There can be more than one vanishing point in a projected image but only one principal vanishing point in a projected image.

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