单项选择题
Which statement is true about a worm attack？（）
A.Human interaction is required to facilitate the spread.
B.The worm executes arbitrary code and installs copies of itself in the memory of the infected computer.
C.Extremely large volumes of requests are sent over a network or over the Internet.
D.Data or commands are injected into an existing stream of data. That stream is passed between a client and server application.
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