The correct answer is C. Exit Office Access 2007.
When you press ALT+F4 in Access, the program will prompt you to save any changes you have made to the current database. If you click Yes, the database will be saved and then closed. If you click No, the database will be closed without being saved. If you click Cancel, the prompt will disappear and you will remain in Access.
Option A is incorrect because pressing ALT+F4 does not open a new database. To open a new database, you can click the File tab and then click New.
Option B is incorrect because pressing ALT+F4 does not open an existing database. To open an existing database, you can click the File tab and then click Open.
Option D is incorrect because pressing ALT+F4 does not do none of the above. Pressing ALT+F4 exits Access.