R1 and R2 cannot form an OSPF adjacency on their shared Ethernet link. Given their show ip ospf interface e0 output, what is the cause?

The show ip ospf interface e0 output would reveal the OSPF hello and dead interval timers. For OSPF routers to form an adjacency, these timers must match exactly on directly connected interfaces. If R1 and R2 have different hello or dead timer settings, they will not establish an adjacency, as they perceive each other as incompatible for OSPF communication. Incorrect options: OSPF area mismatch would be indicated by different area IDs in the output, which is not the case here. Priority affects Designated Router (DR) and Backup Designated Router (BDR) election but does not prevent adjacency formation itself. Cost is used for path selection, not for forming adjacencies. A BDR is elected automatically if there are at least two OSPF routers on a multi-access segment; its absence doesn't prevent adjacency. OSPF process IDs are locally significant and do not need to match between routers for adjacency.