As shown in the figure, the MSR router in the headquarters is connected to the branch through the Ethernet interface E1/0, and the connection is backed up through the ISDN network. Which of the following options is most feasible at this time?

As shown in the figure, the MSR router in the headquarters is connected to the branch through the Ethernet interface E1/0, and the connection is backed up through the ISDN network. Which of the following options is most feasible at this time?
A . The RIP protocol runs on the Ethernet link between the headquarters and the branch. Set a static route, the outbound interface is Bri2/0, take the default priority value
B. The OSPF protocol is run on the Ethernet link between the headquarters and the branch. Set a static route, the outgoing interface is Bri2/0, and the priority value is 5
C. The OSPF protocol is run on the Ethernet link between the headquarters and the branch. Set a static route, the outgoing interface is Bri2/0, and the priority value is 0
D. Run the RIP protocol on the Ethernet link between the headquarters and the branch. Configure a dynamic routing backup group on the outbound interface Bri2/0

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Answer: D