In Quadrantal Bearing System, Back Bearing of a Line May

Multiple Choice

In quadrantal bearing system, back bearing of a line may be obtained from its forward bearing, by

A) adding 180°, if the given bearing is less than 180°
B) subtracting 180°, if the given bearing, is more than 180°
C) changing the cardinal points, i.e. substituting N for S and E for W and vice-versa
D) none of these.