A WLC reports a rogue AP that is actually a legitimate autonomous AP. How do you stop alarms for that AP's MAC?

Setting the AP Class Type to Friendly is the correct solution because it tells the WLC that this specific MAC address belongs to a known, legitimate access point, even if it's not managed by the WLC itself. This prevents the WLC from classifying it as a rogue AP and generating alarms. Removing the AP from WLC management is not applicable as it's an autonomous AP, not managed by the WLC. Placing the AP into manual containment would attempt to neutralize the AP, which is inappropriate for a legitimate device. Manually removing the AP from Pending state is not the correct action; the "Pending" state is for APs awaiting classification, and the goal is to classify it as friendly, not just remove it from a temporary state.