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 enginesB QoSC Traffic shapingD Load balancing
题目
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