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You are at a command prompt on Windows. You suspect that some Windows system files are corrupted. What command should you use to scan for and repair corrupted system files?

A sfc /scannow

The System File Checker (SFC) is a command-line utility that checks and validates the versions of your computer's system files. If system files are corrupted, SFC will replace them with the proper versions. The /scannowoption scans and repairs files, whereas /scanfile only checks a single file. The /verifyonly option examines the integrity of protected system files but does not attempt to fix them. The /verifyfile option is used to check the integrity of a specified file.

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