The current switches all run the MSTP protocol by default, so in the description of the default state, which of the following options is correct?

The current switches all run the MSTP protocol by default, so in the description of the default state, which of the following options is correct?
A . All switches run in the same region by default
B . The calculation speed of STP is faster than when multiple instances are configured
C . Because of lack of configuration, all switches will switch the operating mode to RSTP
D . Each switch runs in an independent region

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Answer: D