How does MSTP maintain compatibility with RSTP?

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How does MSTP maintain compatibility with RSTP?
A . MSTP supports five port states in the same way as RSTP
B . RSTP encodes region information from an MSTP BPDU into a single instance
C . RSTP implements a TTL that is compatible with the MSTP max age timer
D . MSTP sends all spanning-tree information in one BPDU

Answer: D