Refer to the exhibit. What does router R1 use as its OSPF router-ID?
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A. B. C. D.C
OSPF uses the following criteria to select the router ID:
1. Manual configuration of the router ID (via the router-id x.x.x.x command under OSPF router configuration mode).
2. Highest IP address on a loopback interface.
3. Highest IP address on a non-loopback and active (no shutdown) interface.