Which two statements about northbound and southbound APIs are true? (Choose two.)

Which two statements about northbound and southbound APIs are true? (Choose two.)
A . Only southbound APIs allow program control of the network.
B . Only northbound APIs allow program control of the network.
C . Only southbound API interfaces use a Service Abstraction Layer.
D . Only northbound API interfaces use a Service Abstraction Layer.
E . Both northbound and southbound API interfaces use a Service Abstraction Layer.
F . Both northbound and southbound APIs allow program control of the network.

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Answer: BC