You have just brought online a new site of AP43s. While verifying that everything looks good, you notice that all of the access points (APs) are reporting "insufficient power." The APs are connected to an 802. 3at-capable switch.
In this scenario, what would be the cause of the error?

A. The cable run to each AP is too long. B. The Ethernet cable is plugged into the wrong port on the AP. C. The APs' firmware must be upgraded. D. LLDP-MED is not configured on the switch.