Refer to the exhibit.

This warehouse has the dimensions shown in the exhibit. The warehouse is 20 feet (6 m) high up to a steel railing on the celling. The shelves are about 16 feet (5m) high, and they hold large containers filled with fluid and metal equipment.
The customer needs consistent wireless coverage throughout the warehouse, mostly to support the tablets that employees use to run Inventory tracking and other applications. The warehouse staff works in shifts of 20.
The architect has selected AP-515S. About how many APs should the architect propose?