Question: Question 3 You are explaining SDN to a young engineer in your company. Which statement regarding northbound APIs is correct? Northbound APIs are not used

Question 3
You are explaining SDN to a young engineer in your company. Which statement regarding northbound APIs is correct?
Northbound APIs are not used in SDN.
Northbound APIs are used by the controller to dynamically make changes according to real-time needs, as well as retrieve information for the state of the devices.
Northbound APIs are used for communication with the applications and services over the network and by the controller to dynamically make changes according to real-time needs.
Northbound APIs in SDN are used for communication with the applications and services running over the network.

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