单选题Which of these correctly identifies a difference between the way BPDUs are handled by 802.1w and 802.1D？（）A802.1D bridges do not relay BPDUs.B802.1w bridges do not relay BPDUs.C802.1D bridges only relay BPDUs received from the root.D802.1w bridges only relay BPDUs received from the root.
单选题
Which of these correctly identifies a difference between the way BPDUs are handled by 802.1w and 802.1D？（）
A
802.1D bridges do not relay BPDUs.
B
802.1w bridges do not relay BPDUs.
C
802.1D bridges only relay BPDUs received from the root.
D
802.1w bridges only relay BPDUs received from the root.
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