Surveying
If the length of a chain is found to be short on testing, it can be adjusted by

closing the joints of the rings if opened out
All of these
removing one or more small circular rings
straightening the links

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Surveying
In triangulation surveys

All listed here
Control stations are located from which detailed surveys are carried out
The area is divided into triangular figures
Sides are not measured excepting the base line

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the angles around a station should be 360°
All listed here
The sum of the eight angles of a braced quadrilateral should be 360°
The sum of the three angles of a plane triangle should be 180°

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