The topology of a certain network is complex, and there are multiple paths between the core and branches. In order to control the routing between the core and branches, effectively utilize bandwidth resources, and reduce maintenance costs, which of the following measures is optimal?

The topology of a certain network is complex, and there are multiple paths between the core and branches. In order to control the routing between the core and branches, effectively utilize bandwidth resources, and reduce maintenance costs, which of the following measures is optimal?
A . Use RIP as the routing protocol between the core and the branch, and control the routing by adjusting the routing priority
B. Use IPSec to encrypt routing protocol packets between the core and the branch
C. Use IS-IS as the routing protocol between the core and the division, and control routing through routing policies
D. Use fast reroute between core and branch

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Answer: C