Which type of parallel projection has projection vectors not perpendicular to the viewing plane?

Which type of parallel projection has projection vectors not perpendicular to the viewing plane? Correct Answer Oblique Projection

In oblique projection, the projection vectors are not perpendicular to the viewing plane. Angles and lengths are preserved for faces parallel the plane of projection. „ Preserves 3D nature of an object

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Which type of parallel projection has projection vectors perpendicular to the viewing plane?