Which of the following description of the evolutionist in the mainstream SDN model in the industry is correct? (Multiple Choice)

Which of the following description of the evolutionist in the mainstream SDN model in the industry is correct? (Multiple Choice)
A . Control flexibility is moderate and open is not complete
B . Make full use of existing equipment and achieve fast
C . Device programmable, open northbound API interface
D . Try to preserve and reuse existing routing protocols and IP network technologies

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Answer: ABCD