To answer this question, you need to understand what actions can potentially worsen the situation if your system has a virus. Let's go through each option to understand why it is correct or incorrect:

Option A) Defragment the local drive - This option is incorrect because defragmenting the local drive does not directly address the issue of a virus. While defragmenting can improve system performance by organizing files and data on the hard drive, it does not remove or fix viruses.

Option B) Run System backup - This option is incorrect because running a system backup can potentially copy the virus-infected files to the backup location. If the backup is restored on a clean system, it could reintroduce the virus. It is essential to remove the virus before performing a system backup to ensure the backup is clean.

Option C) Shutdown the system - This option is incorrect because shutting down the system does not remove the virus. While a restart can temporarily disrupt the virus's activity, it will not permanently eliminate the threat. To remove the virus, you should use appropriate antivirus software or seek professional help.

Option D) Move the files from a CD to a DVD - This option is incorrect because it is unrelated to the virus issue. Moving files from a CD to a DVD does not address the presence of a virus in the system.

The correct answer is B) Run System backup. This option is incorrect because running a system backup can potentially copy the virus-infected files to the backup location, making the backup unreliable. It is essential to remove the virus before performing a system backup to ensure the backup is clean.

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