You have two database servers SEMP and SACCT. The database in the SEMP server maintains theemployee information and the database in the SACCT server maintains the accounts payable  information.The employees submit the expense reports to the accounts payable department. A user of the accountspayable database wants to extract the employee information from the database in the SEMP server for cross-verification.  Which schema object enables the user to access the information from the remote database（）

• A、Cluster
• B、Database link
• C、Mapping table
• D、Materialized view