A customer wants to deploy 12 FortiAP 431E devices on high density conference center, but they do not currently have any PoE switches to connect them to. They want to be able to run them at full…

A customer wants to deploy 12 FortiAP 431E devices on high density conference center, but they do not currently have any PoE switches to connect them to. They want to be able to run them at full power while having network redundancy. From the FortiSwitch models and sample retail prices shown in the exhibit, which build of materials would have the lowest cost, while fulfilling the customer's requirements?