What are two functionalities of SDN Northbound APIs? (Choose two.)

What are two functionalities of SDN Northbound APIs? (Choose two.)
A . Northbound APIs provide a programmable interface for applications to dynamically configure the network.
B . Northbound APIs form the interface between the SDN controller and business applications.
C . OpenFlow is a standardized northbound API protocol.
D . Northbound APIs use the NETCONF protocol to communicate with applications.
E . Northbound APIs form the interface between the SDN controller and the network switches or routers.

Answer: A,B