589.When a vehicle turns left (right), it should first activate the left (right) turn signal at both the front and rearof the vehicle; when changing lanes, it should first activate the signal in the direction of the intended lanechange. Which of the following is correct? (A) The turn signal should be displayed for 5 seconds. (B) Theturn signal should remain on until the turn or lane change is completed. (C) The turn signal only needs tobe displayed briefly.