You need to make structural changes to the cube. You also need to ensure that appropriate aggregations are created after the changes are made. What should you do?（）

• A、Record a weeks user activity by using SQL Profiler. Apply structural changes. Replay the activity and then run the Usage Based Optimization Wizard.
• B、Apply structural changes. Run the Database Engine Tuning Advisor.
• C、Apply structural changes. Run the Usage Based Optimization Wizard.
• D、Record a weeks user activity by using SQL Profiler. Apply structural changes. Run the Database Engine Tuning Advisor.