单选题An administrator is implementing a second server due to the increased usage. Which of the following optimization techniques is the administrator using?（）ACaching enginesBQoSCTraffic shapingDLoad balancing
单选题
An administrator is implementing a second server due to the increased usage. Which of the following optimization techniques is the administrator using?（）
A
Caching engines
B
QoS
C
Traffic shaping
D
Load balancing
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