Which System File Checker (SFC) command-line option scans the integrity of all protected Windows system files and automatically attempts to replace any corrupted copies it finds with the correct versions from the component store?
/verifyonly
/scanfile
/scannow
/verifyfile
The /scannow switch tells SFC to scan every protected system file and, by default, copy a known-good version from the WinSxS component store over any file that fails the integrity check. Other switches such as /verifyonly or /verifyfile perform a read-only integrity check without attempting repair, while /scanfile examines a single specified file.
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