What is the purpose of this command?

On a Cisco Nexus 7000 Series Switch, what is the purpose of this command?
Switch# config terminal
switch(config)# mac address-table learning-mode conversational vlan 1-10
switch(config)#
A. Enable conversational learning on FabricPath vlans 1-10 for F-Series module
B. Enable FabricPath protocol on VLANs 1-10
C. No need for this command as conversational learning is enabled by default for all VLANs.
D. Enable conversational learning on Classical Ethernet VLAN for F-Series module