A switch runs Open Shortest Path First (OSPF) on an interface and needs to establish an OSPF adjacency or adjacencies on that interface. In which situation should the architect pay particular attention to the OSPF hello timer and possibly tune it to a lower value?
A. when spanning tree is disabled on the switch
B. when the interface is a VLAN interface that does not implement Virtual Router Redundancy Protocol (VRRP)
C. when the interface is a VLAN interface associated with an indirect connection to a single OSPF peer router
D. when the interface is a direct physical link to a single OSPF peer router
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