You create two resource plans，one for data warehouse loading jobs at night and the other for application jobs at day time. You want the resource plans to activate automatically so that the resource allocation is optimum as desired by the activity.  How would you achieve this？（）  

• A、 Implement job classes
• B、 Implement Scheduler windows
• C、 Implement the mapping rule for the consumer groups
• D、 Set the SWITCH_TIME resource plan directive for both the resource plans