http://docs.oracle.com/cd/E11882 ... dbrm.htm#ADMIN12656
Automatic Enabling of the Resource Manager by Oracle Scheduler Windows
The Resource Manager automatically activates if an Oracle Scheduler window that specifies a resource plan opens. When the Scheduler window closes, the resource plan associated with the window is disabled, and the resource plan that was running before the Scheduler window opened is reenabled. (If no resource plan was enabled before the window opened, then the Resource Manager is disabled.) In an Oracle Real Application Clusters environment, a Scheduler window applies to all instances, so the window's resource plan is enabled on every instance.
所以答案是D..