单项选择题

Two Label-Switched Paths called LSP A and LSP B have been configured on a router. LSP A has been configured with a hold-priority of 3. There is insufficient reservable bandwidth along the path to accomodate both LSPs reservation requirements. Which setup priority must LSP B have to pre-empt LSP A and use its bandwidth?（）

A.2
B.3
C.4
D.7

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Which three are well-known mandatory BGP attributes? （）

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