题目内容

Common routes for viurs infiltration incude.

A. floppy disks or other media that users can exchange
B. E-mail attachments
C. pirated software and shareware
D. All of the above

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If a virus simply reproduces and has no cause for an attack phase, but it will still without your permission.

A. hide its own code
B. steal storage and pilfer CPU cycles
C. delete files
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