Which two statements about the STP dispute function are true?

Which two statements about the STP dispute function are true? (Choose two)
A. It compares the downstream port states reported in received BPDUs.
B. The upstream switch uses received BPDUs to detect unidirectional link failures.
C. The downstream switch uses received BPDUs to detect unidirectional link failures.
D. When a designated port detects a conflict, it changes its role by reverting to a discarding state.

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