When configuring OSPF on the ERX， what is the default auto-cost reference-bandwidth value？（）

A. to aggregate routes learned from the ABR
B. to lower the cost of routes advertised by the ABR
C. to connect a non-contiguous area to the backbone
D. to decrease the size of the link-state database in that area

A. Init
B. 2Way
C. ExStart
D. Exchange

A. They are configured per OSPF area.
B. They are configured per virtual router.
C. They are configured per OSPF process.
D. They are configured per OSPF interface.