What is one function of the vSmart controller in an SD-WAN deployment?

What is one function of the vSmart controller in an SD-WAN deployment?

A. orchestrates vEdge and cEdge connectivity B. responsible for the centralized control plane of the SD-WAN network C. provides centralized network management and a GUI to monitor and operate the SD-WAN overlay D. provides a data-plane at branch offices to pass traffic through the SD-WAN network