Which of the following features would BEST be used to optimize real－time voice and video chat?()(Select TWO) A. Load balancingB. Caching enginesC. QosD. Fault tolerance systemsE. Traffic shaping

Which of the following features would BEST be used to optimize real－time voice and video chat?()(Select TWO)

A. Load balancing

B. Caching engines

C. Qos

D. Fault tolerance systems

E. Traffic shaping

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