A box is accelerating to the right on a flat table. Which free-body diagram is correct?

1. mg down and N up (1/35) (3%)
2. mg down, N up, some other force F to the right (0/35) (0%)
3. mg down, N up, a force right and a smaller force left (0/35) (0%)
4. could be 2 or 3 (34/35) (97%)