Which of the following is not a source of virus entering your system?

Correct option is C

Printouts are physical papers and cannot carry digital viruses. Viruses spread through digital storage or internet-based files, not through paper.
Important Key Points:
1. Viruses require digital medium to spread.
2. Pen drives often carry malware.
3. Email attachments can contain infected files.
4. Hard disks may have viruses if infected files are stored.
Knowledge Booster:
1. Computer viruses are software-based malicious programs.
2. Always use antivirus tools for scanning external drives.
3. Avoid opening unknown email attachments.