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.

Answer: Option C

Explanation:

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