Which two options accurately describe the implementation of Fibre Channel domain IDs? (Choose two.)

Which two options accurately describe the implementation of Fibre Channel domain IDs? (Choose two.)
A . are assigned on a per-line card basis
B . must be unique on all of the Fibre Channel switches in the fabric
C . are assigned on a per switch basis
D . are assigned on a per-VSAN basis
E . must be the same on all of the Fibre Channel switches in the fabric

Answer: BC

Explanation:

Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5500/sw/san_switching/6x/b_5500_SAN_Switching_Config_6x/configuring_fibre_channel_domain_parameters.pdf