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.
• E、 Only TLV 22 can be flooded across L1/L2 boundaries.