Examine the following PL/SQL block：   SET SERVEROUTPUT ON SET LONG 10000 ECLARE report clob；  BEGIN report ：= DBMS_SPM.EVOLVE_SQL_PLAN_BASELINE（）； DBMS_OUTPUT.PUT_LINE（report）； END；   Which statement describes the effect of the execution of the above PL/SQL block？（）  

• A、 The plan baselines are verified with the SQL profiles.
• B、 All fixed plan baselines are converted into nonfixed plan baselines.
• C、 All the nonaccepted SQL profiles are accepted into the plan baseline.
• D、 The nonaccepted plans in the SQL Management Base are verified with the existing plan baselines.