You have installed a new router. However, you cannot establish an adjacency with the upstream
router. Which two conditions will prevent adjacency? (Choose two.)

A.
The new router has a higher router priority than the upstream router and refuses to join.

B.
The new router has a lower router priority than the upstream router and refuses to join.

C.
The new router has not been configured with the correct OSPF authentication key.

D.
The new router has a subnet mask that does not match the upstream router.