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A.
Checking of e-mail
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B.
Downloading programs
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C.
Reading from CD/DVD
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D.
Uploading data
Correct Answer: Option D
Explanation
The sources of computer viruses are:
- Downloading Programs. ...
- Pirated or Cracked Software.
- Email Attachments. ...
- Internet.
- Booting Data from Unknown CDs. ...
- Bluetooth. ...
- Unpatched Software.
- Infected disk of a flash drive.
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