What is the reason that the AP20 is not broadcasting SSIDs?

Refer to the exhibit.

A network administrator deploys a Mobility Master (MM)-Mobility Controller (MC) solution in the headquarters. The network administrator prepares the wired side of the network with the proper VLAN, DHCP settings, and routing services to ensure that APs can reach the MCs.
The network administrator connects two APs in different IP segments and waits for 20 minutes, but SSIDs are advertised in one of the APs only. The engineer logs into the MC console and sees the output shown in the exhibit.
What is the reason that the AP20 is not broadcasting SSIDs?
A. IPSec traffic is being blocked.
B. IKE traffic is being dropped.
C. PAPI traffic is being blocked.
D. GRE traffic is being blocked.

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