Function key for receipt voucher is A. F3 B. F4 C. F5 D. F6

The correct answer is: A. F3

The function key for receipt voucher is F3. This is because F3 is the key that is typically used to print a receipt. When you press F3, the computer will open a print dialog box where you can select the printer you want to use and the settings for the print job.

The other options are incorrect because they are not typically used to print a receipt. F4 is typically used to open a file, F5 is typically used to refresh a window, and F6 is typically used to move the cursor to the next field in a form.