Place the following CHP traffic-stop actions in correct chronological order: (1) initiate the stop with emergency lights, (2) observe the vehicle violation, (3) run the plate through dispatch, (4) approach the vehicle behind the B-pillar.

1. 1, 2, 3, 4
2. 2, 3, 1, 4
3. 2, 1, 3, 4
4. 3, 1, 2, 4