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多項選擇題

Which two statements about IS reachability TLV (TLV 2) and the extended IS reachability (TLV 22) are true?()

A. TLV 22 supports wide metrics.
B. TLV 2 is only used in Level 1 routers.
C. TLV 22 displays the neighbor's extended areas.
D. Only TLV 22 can support the inclusion of sub-TLVs.

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