Due to the portability and simplicity of smartphones, the risks posed by mobile phone viruses and malware are even higher than the spread of viruses between computers. From the perspective of the way mobile phone viruses are transmitted, Bluetooth devices, web browsing, and software downloads are mainly used. Short-sleeve MMS and computer connection. From the perspective of the technical performance of smartphones, its mobile storage function and short-range wireless transmission technology enable the frequent delivery of data from the network to mobile phones, and between mobile phones and mobile phones. Increased frequency of transmission of the virus. What does this text mainly want to express? ['A. Functional mobile phone performance needs to be improved.', 'There are many ways to spread mobile phone viruses.', 'Functional phones are at risk of spreading viruses.', 'Disadvantages brought by the development of wireless technology.']