Which two statements are correct regarding Flex Links？ （）

• A、 An interface can belong to multiple Flex Links.
• B、 Flex Links operate only over single pairs of links.
• C、 Flex Link pairs must be of the same interface type
• D、 Flex Links automatically disable STP so no BPDUs are propagated
• E、 Failover from active to standby on Flex Links takes less than a second