Which two options are possible reasons that prevent OSPFv3 to form between these two routers?

Two routers are trying to establish an OSPFv3 adjacency over an Ethernet link, but the adjacency is not
forming. Which two options are possible reasons that prevent OSPFv3 to form between these two routers? (Choose two.)

A.
mismatch area types

B.
mismatch of subnet masks

C.
mismatch of network types

D.
mismatch of authentication types

E.
mismatch of instance IDs