Pick up the correct statement from the following:
(A) The directions of plumb lines suspended at different points in a survey are not strictly
parallel
(B) In surveys of small extent, the effect of curvature may be ignored and the level surface of
the earth is assumed as horizontal
(C) In surveys of large extent, the effect of curvature of the earth must be considered
(D) All the above
(A) The directions of plumb lines suspended at different points in a survey are not strictly
parallel
(B) In surveys of small extent, the effect of curvature may be ignored and the level surface of
the earth is assumed as horizontal
(C) In surveys of large extent, the effect of curvature of the earth must be considered
(D) All the above