You have implemented flow-based sFlow in your Brocade VCS Fabric by enabling sFlow
globally on each Brocade VDX. You are not receiving any statistics in your sFlow collector
from these devices. What must happen to start collecting data?

A.
Enable sFlow on ISLs.

B.
Enable sFlow on individual interfaces.

C.
Enable sFlow on port channels.

D.
Enable sFlow on vLAGS.