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单选题
Which is not a reason that Internet Service Providers prefer to use PPP over Ethernet (PPoE)?（）
A
access control and billing can be done on a per-user, rather than a per-site basis
B
supports Link Fragmentation and Interleaving
C
provides the ability to connect a network of hosts over a simple bridging access device
D
provides a consistent means of authenticating users (RADIUS for example)
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