多项选择题
Flex Links are a pair of a Layer 2 interfaces (switchports or port channels), where one interface is configured to act as a backup to the other. Which two statements are correct regarding Flex Links?（）
A. An interface can only belong to single Flex Links.
B. An interface can belong to multiple Flex Links.
C. Flex Links operate only over single pairs of links.
D. Flex Links automatically disable STP so no BPDUs are propagated.
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