How does MSTP maintain compatibility with RSTP?

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

Answer: C