Correct option is C
Resection:
It is a method of orientation employed when the table occupies a position which is not yet located on the drawing sheet.
Position of instrument station occupied by the plane table can be drawn on sheet (or map) with the help of two or more well defined points which are visible from instrument station and whose positions have already been drawn on plan map.
Methods of Resection in plane table surveying:
1. Back ray Method
2. Two-point Problem
3. Three-point Problem
Three-point problem can be further divided into following methods:
1. Mechanical Methods
2. Graphical Method (Bessel's Solution)
3. Trial and Error Method (Lehmann's Method)
Lehmann's Method:
This method is very commonly used in field
It is quite quick and very accurate.
