Which of the following technologies can improve convergence time following a link failure in a serviceprovider network？（）

A.Lower power consumption
B.Lower maintenance cost
C.Simplified configuration
D.Deterministic performance
E.Longer uptime

A.AF Class
B.Drop Probability
C.CS（Class Selector Value ）
D.PHB （Per-Hop Behavior ）
E.IP Precedence
F.Queue Depth