Refer to the exhibit. What does router R1 use as its OSPF router-ID?
OSPF uses the following criteria to select the router ID:
1. Manual configuration of the router ID (via the ג€router-id x.x.x.xג€ 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.