To answer this question, you need to understand the file extensions used for QTP (QuickTest Professional) script files.
Option A) *.mts - This option is incorrect. The file extension .mts is not commonly used for QTP script files.
Option B) *.usr - This option is incorrect. The file extension .usr is not commonly used for QTP script files.
Option C) *.mtr - This option is incorrect. The file extension .mtr is not commonly used for QTP script files.
Option D) *.vbs - This option is incorrect. The file extension .vbs is commonly used for VBScript files, which can be used in QTP scripts, but it is not the specific file extension for QTP script files.
The correct answer is A) *.mts. This option is incorrect because the file extension .mts is not commonly used for QTP script files.