单选题Which spanning Tree Protocol has been implemented on switch 2？ （）ASTP/IEEE 802.1DBMSTP/IEEE 802.1sCPVST+DPVRSTENone of the other alternatives apply
单选题
Which spanning Tree Protocol has been implemented on switch 2？ （）
A
STP/IEEE 802.1D
B
MSTP/IEEE 802.1s
C
PVST+
D
PVRST
E
None of the other alternatives apply
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