The correct answer is: A. Changing current date.
F2 is used to change the current date in QuickBooks. This can be useful if you need to enter transactions for a different date than the current date. To change the current date, press F2 and then enter the new date.
Option B is incorrect because F2 does not change the current period. The current period is the period of time that QuickBooks is currently using. To change the current period, go to the Company menu and select Change Period.
Option C is incorrect because F2 does not change the voucher. A voucher is a document that is used to record a transaction. To change the voucher, go to the Vouchers menu and select Change Voucher.
Option D is incorrect because F2 does not select a payment voucher. A payment voucher is a document that is used to record a payment. To select a payment voucher, go to the Payments menu and select Select Payment Voucher.