Should be A:
The hub and local branch devices advertise the services available in their networks to the Cisco SD-WAN Controllers in its domain using service routes, which are sent by way of OMP using the service route Subsequent Address Family Identifier (SAFI) bits of the OMP NLRI. The Cisco SD-WAN Controllers maintain the service routes in their RIB, and they do not propagate these routes to the devices.
https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/policies/vedge/policies-book/service-chaining.html#c_Service_Chaining_Configuration_Examples_12239.xml
A is correct. In the context of managing and maintaining routes for WAN edge devices in a software-defined network, such as Cisco SD-WAN, the vSmart controller utilizes the Routing Information Base (RIB). The RIB is where routing information, including service routes, is stored and managed, and it's overseen by the vSmart controller.
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