A technician is preparing user education to raise awareness of malware. The technician’s goal is to increase user awareness and prevent the future spread of malware. All of the following are malware symptoms EXCEPT:（）
- A、increased number of pop-ups.
- B、decreased volume of spam.
- C、decreased system performance.
- D、home page hijacking.
正确答案:B
答案解析:有
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