What is the difference between ‘Open'and ‘Open Exclusively'?

• A. a. Open statement opens access database files and Open Exclusively opens database files of other program like Oracle
• B. b. Open Exclusive locks whole database so that no one can access it whereas Open locks only the record that is being accessed
• C. c. Both Open and Open Exclusively are same
• D. d. Open Exclusive command does not exist in MS Access