What are the meanings of the eight shapes of signs: octagon, triangle, vertical rectangle, pentagon, round, pennant, diamond, horizontal rectangle?
1) Stop sign, yield sign, no entry sign, railroad crossing sign, roundabout sign, school zone sign, warning sign, speed limit sign
2) Warning sign, yield sign, stop sign, school zone sign, speed limit sign, no entry sign, railroad crossing sign, roundabout sign
3) No entry sign, stop sign, yield sign, roundabout sign, school zone sign, warning sign, speed limit sign, railroad crossing sign
4) Speed limit sign, stop sign, yield sign, school zone sign, warning sign, no entry sign, roundabout sign, railroad crossing sign