The correct answer is D.

The LAN Edge 7.6 Architect study guide directly explains this exact behavior for SSIDs configured on FortiManager.

The study guide states:

“In central management mode, profiles are created and stored on FortiManager. An AP profile is distributed to a controller when at least one of its supported APs is assigned the profile and the device settings are installed. SSID profiles are delivered only when you select Manual in the SSID field.”

It further says:

“If you create an SSID profile centrally and configure all the AP profiles to be tunnel or bridge, the SSID profile is not delivered to FortiGate. FortiManager does not know which of the SSID profiles to distribute to which FortiGate.”

And the guide gives the exact fix:

“A manual SSID explicitly tells FortiManager which SSID profile to broadcast on the AP and, as a result, the required SSID profile is delivered to the controller.”

Another extract from the same section confirms:

“When you want to broadcast an SSID, you must configure the AP profile that is being used by the APs that are to transmit it... Manual: You can select a mix of SSIDs to broadcast.”

So in this scenario, the AP profile must be changed from Bridge or Tunnel to Manual, and then the required SSIDs must be explicitly selected.

Why the other options are incorrect:

A. Incorrect. The issue is not the AP platform. The study guide identifies the problem as SSID delivery and mapping from FortiManager to FortiGate, not AP hardware support

B. Incorrect. The study guide explicitly says Manual can be used to “select a mix of SSIDs to broadcast,” so a mix is supported when Manual is chosen

C. Incorrect. Transmit Power Mode affects RF behavior, not whether FortiManager delivers SSID profiles to FortiGate. The problem here is SSID assignment and profile distribution, not radio power.

Extra confirmation from FortiGate Cloud administration guidance:

“To configure the SSID that you created select Manual for SSIDs then select the SSID from the dialog.”

Final verified conclusion:

Because the SSIDs were created on FortiManager and are not being broadcast, the AP profile must use Manual in the SSIDs field and the intended SSIDs must be explicitly selected.

So the correct answer is D.