When configuring OSPF on Tier-0 Gateway, which three of the following must match in order to establish a neighbor relationship with an upstream router? (Choose three.)
Area ID: Both routers must belong to the same OSPF area for a neighbor relationship to form.
MTU of the Uplink: Mismatched MTU settings can prevent the OSPF adjacency from forming, as OSPF packets may be dropped if they exceed the MTU size.
Subnet mask: Both routers must have the same subnet mask on the interface where OSPF is configured to establish a neighbor relationship.
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