A network engineer is tasked with installing wireless access points in a new office building. The access points are designed to operate on POE+ and require 25 watts of power each to function with all features enabled. The engineer must select a switch with PoE capabilities that can support these power requirements. Which of the following PoE standards must the switch support to properly power the access points?
IEEE 802.3af (PoE)
IEEE 802.3bt
Non-standard proprietary PoE
IEEE 802.3at (PoE+)