An OSPF neighbor between routers R1 and R2 is stuck in loading state on R2. What are two causes? (Choose two.)
A. OSPF is not enabled on the interfaces.
B. A firewall filter is blocking OSPF hellos on both sides.
C. The R1 router has received a corrupted link-state request packet.
D. The interface MTU is mismatched between the routers.
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