Correct option is A
Theodolite has two types of adjustments:
(1) Temporary (2) Permanent.
Permanent Adjustment of Theodolite are
Adjustment of Horizontal Plate Levels:
The axis of the plate levels must be perpendicular to the vertical axis.
Collimation Adjustment:
The line of collimation should coincide with the axis of the telescope and the axis of the objective slide and should be at right angles to the horizontal axis.
Horizontal axis adjustment:
The horizontal axis must be perpendicular to the vertical axis.
Adjustment of Telescope Level or the Altitude Level Plate Levels:
The axis of the telescope levels or the altitude level must be parallel to the line of collimation.
Temporary Adjustment:
There are three temporary adjustments of a theodolite: 1.Centering; 2. Levelling; 3. Focussing.
