单选题Which of these Layer 2 access designs does not support VLAN extensions？（）AFlexLinksBloop-free UClooped squareDlooped triangleEloop-free inverted U
单选题
Which of these Layer 2 access designs does not support VLAN extensions？（）
A
FlexLinks
B
loop-free U
C
looped square
D
looped triangle
E
loop-free inverted U
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