View the Exhibit to examine the output produced by the following query at three different times sincethe database instance started and has experienced workloads of different capacities：  SQL> SELECT substr（component， 0， 10） COMP， current_size CS，user_specified_size USFROM v$memory_dynamic_componentsWHERE current_size!=0；  What do you infer from this（）

• A、The database instance is running with manual PGA management.
• B、The database instance is running with manual shared memory management.
• C、The database instance has the MEMORY_TARGET value set to a nonzero value.
• D、All sessions are connected to the database instance in dedicated mode， and no RMAN or parallelquery operations have been performed.