Which three of the following components must be elected before the Spanning Tree Protocol can converge in a switched LAN? (Choose three.)

Which three of the following components must be elected before the Spanning Tree Protocol can converge in a switched LAN? (Choose three.)
A . designated ports
B . duplex operating mode
C . fast mode ports
D . root bridge
E . root ports
F . BDPU priority

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Answer: A, D, E