A technician connects a Cisco Aironet 3700 Series access point to a switch and realizes that the AP is coming up with 3x3 MIMO. What explains this behavior? 

Answer options:

A. A redundant power supply is unavailable on the switch.
B. The switch is 802.3af capable.
C. The AP is getting power from a power injector.
D. The switch is PoE+ capable.

D