MSTP solves many shortcomings of the single spanning tree of RSTP and STP. Regarding the MSTP, which of the following description is correct?

MSTP solves many shortcomings of the single spanning tree of RSTP and STP. Regarding the MSTP, which of the following description is correct?
A . Each MST INSTANCE uses a separate STP algorithm to calculate a separate spanning tree
B . Each MST INSTANCE has an identifier, MSTID is a one-byte integer
C . All VLANs are mapped to MST INSTANCE 1 by default
D . MSTP allows one or more VLANs to be mapped to a MST instance, MSTP calculates the root switch separately for each MST INSTANCE, and sets the port status separately

Answer: D

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