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