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Implementing and Operating Cisco Security Core Technologies (SCOR) · Cisco
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C appears most accurate here
C is the best amongst a bunch of really bad alternatives. Don't think its B as there is mention of REST but not REST API. Don't think its either A or D because SDN controllers either control north (application) or south (network/switch)
C. to enable the controller to make changes. The southbound API protocol of a Software-Defined Network (SDN) enables communication between the SDN controller and the networking devices, such as switches and routers, in the network. This allows the controller to make changes and manage the network's configuration.