What belongs to the new requirement of PTN smooth evolution to support 5G bearer is (multiple choice, 4 points)

What belongs to the new requirement of PTN smooth evolution to support 5G bearer is (multiple choice, 4 points)
A . SPTN deployment enhances business flexibility
B . Network Slicing Evolution: FlexE
C . Service Evolution: SR-TP/L3
D . Bandwidth evolution: 50/200/400GE

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Answer: A,B,C,D