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问题：
[不定项选择题] 资料：As more personal business is conducted through smartphone devices , more users are implementing security measures for their devices, according to a recent survey by Harris Poll and commissioned by
A、Smartphone users are increasingly aware of the importance of anti-virus software.
B、An increasing number of smartphone users have installed built-in remote lock-and-erase software.
C、More smartphone users are protecting their devices with PINs and passwords than in previous years.
D、All of above.
参考答案：
D、All of above.
● 参考解析
