The correct answer is: B. Open Exclusive locks whole database so that no one can access it whereas Open locks only the record that is being accessed.
The Open statement opens a database file for reading or writing. The Open Exclusive statement opens a database file for exclusive use, which means that no other user can open the database file until the current user closes it.
Option A is incorrect because the Open statement can be used to open database files of any type, not just Access database files.
Option C is incorrect because the Open and Open Exclusive statements are different. The Open statement allows multiple users to access the database file at the same time, while the Open Exclusive statement only allows the current user to access the database file.
Option D is incorrect because the Open Exclusive command does exist in MS Access.