A home user has opened a 1Mb/s bandwidth, and in order to improve the user experience, the operator can stabilize 2Mb/s when measuring speed If we use the listening bucket technology to achieve this requirement, which of the following methods is optimal.

A home user has opened a 1Mb/s bandwidth, and in order to improve the user experience, the operator can stabilize 2Mb/s when measuring speed If we use the listening bucket technology to achieve this requirement, which of the following methods is optimal.
A . cir 10000 pir 12000
B . cir 10o00 cbs 12000 pbd 12000
C . cir 8000 pir 12000
D . cir 10000 cbs 10000 pbs 12000

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Answer: A