What are two differences between OSPF and IS-IS? (Choose two.)

What are two differences between OSPF and IS-IS? (Choose two.)
A . OSPF is a link-state routing protocol, and IS-IS is a distance-vector routing protocol.
B. OSPF uses a router ID to identify a router, and IS-IS uses a system ID.
C. OSPF elects a DR and a BDR, and IS-IS elects a DIS.
D. Unlike OSPF. IS-IS supports virtual links.
E. Unlike IS-IS routers, an OSPF router belongs to only one area in addition to the backbone area.

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Answer: B,C