If the apparent and the true inclinations of a line with HP are equal, the line is ____________
(a) parallel to horizontal plane
(b) parallel to vertical plane
(c) parallel to profile plane
(d) inclined to both reference plane
I got this question in an interview for job.
My question is from Projection of Straight Lines in portion Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing