A computer with the Windows 7 operating system fails to boot when the system is powered on. The technician suspects that the operating system has been attacked by a virus that rendered the system inoperable. What measure could be taken to restore system functionality?

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Question:
A computer with the Windows 7 operating system fails to boot when the system is powered on. The technician suspects that the operating system has been attacked by a virus that rendered the system inoperable. What measure could be taken to restore system functionality?

Use a differential backup to restore the system.
Use an incremental backup to restore the system.
Use a system image that was created prior to the failure to restore the system.
Run chkdsk on the affected drive to restore system files to their post-installation state.

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