多项选择题

Which three Layer 2 access designs have all of their uplinks in an active state？（）

A. Flex Links
B. loop free U
C. looped square
D. looped triangle
E. loop-tree inverted U

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CCDP(642-874)

Which three Layer 2 access designs have all of their uplinks in an active state？ （）

Which three Layer 2 access designs have all of their uplinks in an active state？（）