题目：Which of the following is RIGHT about the infection strategies of viruses? __________
- A. All original viruses must modify the copies in metamorphic viruses for sprea
- B. All viruses pretend that they are executable files in order to replicate themselves.
- C. The success of viruses all relies on their fast infection rate to sprea
- D. Viruses may take advantage of present network services to facilitate their sprea
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