In order to give priority to the use of high-bandwidth links and achieve the purpose of route backup, which of the following solutions is the most reasonable?

As shown in the figure, the actual bandwidth of the Ethernet interface E1/0 of the MSR router is 10Mbps, and the actual link bandwidth of the serial port S2/0 is 64Kbps.

In order to give priority to the use of high-bandwidth links and achieve the purpose of route backup, which of the following solutions is the most reasonable?
A . Both Ethernet interface E1/0 and serial port S2/0 run RIP protocol
B. Set static routing, the outbound interface is serial port S2/0 and Ethernet interface E1/0, and the priority value is set to be the same
C. The Ethernet interface runs the RIP protocol. Then set static routing, the outgoing interface is serial port S2/0, and the priority value is set to 80
D. The Ethernet interface runs the OSPF protocol. Then set static routing, the outgoing interface is serial port S2/0, and the priority value is set to 80

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Answer: D