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

"The optimal rate for sending multicast frames is based on the highest broadcast rate across all associated clients

When this option is enabled the minimum default rate for multicast traffic is set to 12 Mbps for 5 GHz

The optimal rate for sending multicast frames is based on the lowest broadcast rate across all associated clients.

The optimal rate for sending multicast frames is based on the lowest unicast rate across all associated clients.