What are two criteria that distinguish different Aruba Mobility Controller (MC) models from each other?

What are two criteria that distinguish different Aruba Mobility Controller (MC) models from each other?
A. firewall speed and ability to act as a standalone controller or not
B. number of supported users and firewall throughput
C. number of supported APs and ability to support 802.11ac APs or not
D. number of supported users and ability to support 802.11ac APs or not

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