Final answer:
OpenFlow is the SDN technology that uses an imperative model, sending detailed instructions to the SDN controller to manage the network and policies.
Step-by-step explanation:
The question refers to the use of an imperative Software-Defined Networking (SDN) model. In this model, when a new policy is configured, detailed instructions are sent to the SDN controller, which is responsible for managing both the network and the policies applied to the devices. Among the given options, OpenFlow is the SDN technology that fits this description. OpenFlow allows the path of network packets through the network of switches to be determined by the SDN controller by sending detailed instructions from the controller to the network devices. It is this technology that enables the SDN infrastructure to be centrally managed by the controller, separating the control plane (the SDN controller) from the data plane (the switches).