Can U restrict file types for upload into a document library?
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Not Possible
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Restrict only certain file types.
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Restrict any file type by doing as below, Central administration page >Under operations > Blocked File Types and Add .extension of the file type
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Restrict any file type by doing as below, Site setting >Under Gallery > Blocked File Types and Add .extension of the file type
File type restrictions in SharePoint are configured through Central Administration under Operations > Blocked File Types. This global setting allows administrators to block specific file extensions (like .exe or .bat) from being uploaded anywhere in the farm. Option D is incorrect because Site Settings don't control this farm-level feature.
Yes — in classic (on-premises) SharePoint, an administrator can restrict which file types are allowed into document libraries by going to Central Administration > Security (Operations, in older versions) > Blocked File Types, and adding the file extensions (e.g., .exe, .bat) to block. This is a farm-wide setting, not something configured per-site via Site Settings > Gallery (which manages content types/templates, not upload blocking), so that option is wrong. 'Not possible' and 'restrict only certain types' are both wrong/incomplete since the feature exists and lets admins block any extension they choose.