Is it mandatory to signal when deviating from the driving lane to the right or to the left?

1. AThere is no obligation to signal if the deviation is significant and all drivers notice it.
2. BThere is no obligation to signal when deviating from lane to lane.
3. CIn an insignificant deviation from the lane there is no obligation to signal.
4. DIt is mandatory to signal before any deviation from the driving lane, and until it is completed.

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