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问题：
[不定项选择题] 资料：With 55% of consumers' customer service interactions starting online and 63% of adults using their smartphone several times a month to seek customer service， your mobile customer service tactics ar
A、Fast response
B、Readily accessible information
C、Optimized user surface
D、All of these above
参考答案：
D、All of these above
● 参考解析
