Which two statements about root guard are true? (Choose two)

Which two statements about root guard are true? (Choose two)
A . It allows unknown devices to participate in STP
B . It automatically re-enables blocked ports
C . It requires the administrator to manually re-enable ports that have been blocked
D . It supports the errdisable-timeout command
E . It automatically error-disables a port when PortFast is enabled
F . It blocks BPDUs from unknown devices

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Answer: C, D