When should we turn off the indicator while overtaking?

A)Once we have passed the vehicle we are overtaking.
B)Before reaching the level of the vehicle we are overtaking.
C)Once the lateral movement has been completed.Correct
The direction indicator is used to indicate that we are moving laterally. Once this movement is finished, we will turn it off, so we will pass the vehicle in front of us without having that indicator activated.
Once we have passed the overtaken vehicle, we will signal the lateral movement to the right, to indicate the return to the lane.
Once we have passed the overtaken vehicle, we will signal the lateral movement to the right, to indicate the return to the lane.