Which statement about the hooligan ON U is correct? (Multiple choice)

Which statement about the hooligan ON U is correct? (Multiple choice)
A . The PoN system comes with a rogue detection function
B. The rogue ONU is mainly divided into random light and long light onu
C. A rogue ONU may cause the ONU to fail to register
D. Rogue Onu does not affect user business, but only affects system management

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Answer: ABC