You are about to design a very fast convergence time on a service provider network. Which feature wouldyou utilize to declare a link failure within less than two seconds of the fault on a link？（）

A.IPsec tunnel
B.routing equivalence paths
C.traffic engineering tunnel
D.bridge or switch instance
E.groups of IP addresses

A.8
B.4
C.3
D.1
E.2

A.one route processor （RP） Card and one modular services card （MSC）
B.one distributed route processor （DRP） and one S13 fabric card （SFC）
C.one line card chassis （LCC） and one fabric card chassis （FCC）
D.one route processor （RP） and one fabric card chassis （FCC）
E.one line card chassis （LCC） and one S13 fabric card （SFC）