Which of these corre

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.