You need to ensure that database schema changes in branch offices result in the proper notifications. What should you do?（）

• A、Install Notification Services on all branch office servers， and configure Notification Services to use a local notifications database.
• B、Specify that all SQL Server log files must be archived and sent by e-mail to the main office. 
• C、Implement DML triggers that use Database Mail to send an e-mail message about the DML activity.
• D、Implement DDL triggers that use Database Mail to send an e-mail message about the DDL activity.