* Two
Step-by-step explanation:
- The minimum inventory level is 6 bottles.
- There are currently 5 bottles on the shelf.
- To reach the minimum level of 6 bottles, the technician needs to order 6 - 5 = 1 more bottle.
- However, the maximum inventory level is 12 bottles.
- With 5 bottles currently on the shelf, the technician can order up to 12 - 5 = 7 more bottles.
- Therefore, to reach the minimum level of 6 without exceeding the maximum of 12, the technician should order 2 bottles.