Which solution ensures that there is management access to the MCs in case of an MM failure due to a datacenter outage?

An airline wants to invest in an Aruba Mobility (MM)-Mobility Controller (MC) solution for the three hubs it has throughout the country. A single MM is located in the datacenter at one of the hubs. The MCs in the other two hubs reach the MM through a site-to-site IPSec VPN.
The operations team does not want to lose monitoring and configuration control of the MCs if something happens to the datacenter where the MM resides.
Which solution ensures that there is management access to the MCs in case of an MM failure due to a datacenter outage?
A. Deploy another MM in a different location, and enable L2 redundancy.
B. Install AirWave Management Platform, and enable Read and Write Management access on devices.
C. Deploy another MM in a different location, and enable L3 redundancy.
D. Deploy a local MM on each hub, and synchronize the configuration between all MMs.

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