Which reason explains this behavior?

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A technician connects a Cisco Aironet 3700 Series access point to a switch and realizes that the AP is coming up with 3×3 MIMO .

Which reason explains this behavior?
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.

Answer: B