Formation width of a hill road is the distance between
(A) Outer end of side drain to outer end of parapet wall
(B) Outer end of side drain to inner end of parapet wall
(C) Inner end of side drain to outer end of parapet wall
(D) Inner end of side drain to inner end of parapet wall
(A) Outer end of side drain to outer end of parapet wall
(B) Outer end of side drain to inner end of parapet wall
(C) Inner end of side drain to outer end of parapet wall
(D) Inner end of side drain to inner end of parapet wall