What are two enhancements that OSPFv3 supports over OSPFv2?

What are two enhancements that OSPFv3 supports over OSPFv2? (Choose two.)

A.
It requires the use of ARP.

B.
It can support multiple IPv6 subnets on a single link.

C.
It supports up to 2 instances of OSPFv3 over a common link.

D.
It routes over links rather than over networks.