A theodolite is said to be in perfect adjustment if
(A) Rotation axis is vertical to the transit axis
(B) Transit axis is perpendicular to line of collimation
(C) Line of collimation sweeps out a vertical plane while the telescope is elevated or depressed
(D) All the above
(A) Rotation axis is vertical to the transit axis
(B) Transit axis is perpendicular to line of collimation
(C) Line of collimation sweeps out a vertical plane while the telescope is elevated or depressed
(D) All the above