Choose two. Which two configuration mismatches will prevent two routers from forming an EIGRP adjacency?

EIGRP routers must have matching autonomous system (AS) numbers to form an adjacency. The AS number defines the EIGRP routing domain, and routers in different ASes will not exchange routing information. Similarly, EIGRP uses K-values (metric weights) to calculate the composite metric. If these K-values differ between two routers, they will calculate different metrics for the same routes, preventing adjacency formation. Different router IDs are permissible as they uniquely identify the router within the EIGRP domain but do not prevent adjacency. Different clock rates on serial interfaces can cause physical layer issues but do not directly prevent EIGRP adjacency formation if the link is otherwise operational.