The extension for a database file is .NSF
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Notes Storage Facility
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Notes Template Facility
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Both
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None
A
Correct answer
Explanation
The .NSF extension stands for 'Notes Storage Facility' and is used for standard database files in Lotus Notes/Domino. These files store both the application design elements and user data. Option B is incorrect because .NTF is the extension for template files, not regular databases. NSF files are the runtime databases that users interact with.