Which set of signs or markings is a complete railroad-crossing warning system described in the Arkansas guide?

1. Round advance warning sign, X and RR pavement markings, crossbuck, stop line, gates or flashing lights when present
2. Blue service sign, brown recreation sign, parking lines, and mile marker
3. School pentagon, pedestrian crossing sign, bicycle box, and bus lane sign
4. Speed limit sign, no U-turn sign, route shield, and green guide sign