B (OpenFlow):OpenFlow is a widely used SDN southbound protocol that enables controllers to directly manage forwarding tables of switches.
D (Open vSwitch Database - OVSDB):OVSDB is used by SDN controllers (especially in virtualized environments) to manage configuration state and flow entries on Open vSwitch instances.
Other options explained:
A/C: Non-existent protocols.
E: NetFlow is a traffic monitoring protocol, not a control interface for SDN controllers.
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