You are developing an application to manage the traffic flow of a switch using an
OpenDaylight controller.Knowing you use a Northbound which statement is true?

A.
We must teach our applications about the Southbound protocol(s) used.

B.
Different applications ,even in different languages ,cannot use the same functions in a
REST API at the same time.

C.
The applications are considered to be the clients , and the controller is considered to
be the server

D.
The server retains client state records