Which two statements about MST are true? (Choose two)

Which two statements about MST are true? (Choose two)
A . An MSTI is a single PVST instance
B . An MST region is defined by its name, configuration revision, and VLAN-to-instance mapping table
C . In an MST region, switches run a single IST and zero or more additional MSTIs
D . BPDUs carry VLAN-to-instance mapping information to switches in the same region
E . Each MSTI sends its own independent BPDUs

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Answer: AC