How can network administrator provide high availability for APs deployed in an Aruba Mobility Master (MM)-based architecture?

How can network administrator provide high availability for APs deployed in an Aruba Mobility Master (MM)-based architecture?
A. Establish clusters of Mobility Controllers (MCs).
B. Configure MM to provide backup AP tunnel termination in case of controller failure.
C. Deploy all licenses locally to APs, so that they can continue to function if they lose contact with their controller.
D. Configure APs to convert to controller-less Instant AP mode during controller failure.

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