單項選擇題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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