An OSPF non-backbone area follows external routes to be flooded within the area. These external routes are propagated into other areas. However， external routes from other areas are not allowed to enter this area. Which type of OSPF area does this describe？（）

A.set protocols rsvp cspf-enable
B.set protocols mpls cspf-enable
C.set protocols rsvp traffic-engineering
D.set protocols ospf traffic-engineering

A.Nothing， wide metrics are used by default in IS-IS
B.Enable wide-metrics-only under protocol IS-IS
C.Enable traffic-engineering under protocols IS-IS
D.Disable TVL’s 2 and 128 which carry the 6-bit metrics （0-63）.

A.Prune links that are bidirectional.
B.Eliminate paths with insufficient MTU
C.Eliminate paths of more than 15 hops.
D.Prune links that do not contain the included administrative group.