Regarding the port path cost in the STP protocol, which of the following statement is correct?

Regarding the port path cost in the STP protocol, which of the following statement is correct?
A . Users cannot configure it
B . If the user configures it as the default, the actual cost value is calculated based on the actual link rate.
C . Path cost depends only on the user’s configuration
D . It is recommended that the user configure the path cost value of all ports to optimize the network structure.

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Answer: B