![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
How do Grokster and Kazaa work?
A.
They sold millions of digitla copies of new films to users.
B.
They help interconnected users to exchange digital files on their computers.
C.
They post movies and other contents on their websites.
D.
They offer downloading service for a fee.