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 onthe databaseinstance untiltheSGA_MAX_SIZE parameter is specified.