The author wants to tell us thatA．alertness can best counter spam and criminals sending it

The author wants to tell us that

A．alertness can best counter spam and criminals sending it.

B．technology can solve the problem of spam to a certain degree.

C．Internet users should have confidence in dealing with spam.

D．spam will in the end disappear from the Internet.

请帮忙给出正确答案和分析，谢谢！

参考答案

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