How is Multicast Transmission Optimization implemented in an HPE Aruba wireless network?

How is Multicast Transmission Optimization implemented in an HPE Aruba wireless network?
A . "The optimal rate for sending multicast frames is based on the highest broadcast rate across all associated clients
B . When this option is enabled the minimum default rate for multicast traffic is set to 12 Mbps for 5 GHz
C . The optimal rate for sending multicast frames is based on the lowest broadcast rate across all associated clients.
D . The optimal rate for sending multicast frames is based on the lowest unicast rate across all associated clients.

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Answer: D