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The positions of reference line and top view in 3rd angle projection are?

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The positions of reference line and top view in 3rd angle projection are?

(a) reference line lies above the top view

(b) reference line lies below the top view

(c) reference line lie left side to top view

(d) reference line lie right side to top view

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Question is from Third Angle Projection Method topic in portion Loci of Points & Orthographic Projections of Engineering Drawing

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Correct choice is (b) reference line lies below the top view

The explanation: Reference line will be the xy line which is formed by an intersection of vertical plane and horizontal plane. In the third angle projection the projections of object are taken by placing object in 3rd quadrant and top view is projected on to horizontal plane which is above the reference line.

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