Which of the following types of DBA bandwidth will reduce the upstream bandwidth of the PON port after the DBA horizontal board is configured and successfully used by the ONT? (Multiple choice)

Which of the following types of DBA bandwidth will reduce the upstream bandwidth of the PON port after the DBA horizontal board is configured and successfully used by the ONT? (Multiple choice)
A . assure
B. max
C. best effort
D. fixed

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Answer: AD