Surveying
The prismatic compass and surveyor’s compass

both give QB of a line and WCB of a line
both give WCB of a line
both give QB of a line
give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively

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Surveying
For a line AB

the forebearing of AB and back bearing of AB differ by 180°
none is correct
both (A) and (B) are correct
the forebearing of AB and back bearing of BA differ by 180°

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