Which set of Vector Directory Number (VDN)/Vector types are used for multi-site Best Service Routing (BSR)?

Which set of Vector Directory Number (VDN)/Vector types are used for multi-site Best Service Routing (BSR)?
A . Interflow, Outflow, and 1st Available
B . Primary, Status poll, and Outflow
C . Status poll, Interflow, and 1st available
D . Primary, Status poll, and Interflow

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Answer: D