View the Exhibit and examine the output of the query.  What do you infer from this（）

• A、The SGA_TARGET is a static parameter.
• B、The instance is started， but the database is not yet open.
• C、The server parameter file （SPFILE） was used to start the instance.
• D、The SGA_TARGET parameter does not have any effect on the database instance until theSGA_MAX_SIZE parameter is specified