To generate recommendations to improve the performance of a set of SQL queries in an application, you execute the following blocks of code: The blocks of code execute successfully; however, you do not get the required outcome. What could be the reason?（）

• A、A template needs to be associated with the task.
• B、A workload needs to be associated with the task.
• C、The partial or complete workload scope needs to be associated with the task.
• D、The type of structures (indexes, materialized views, or partitions) to be recommended need to be specified for the task.