Evaluatethefollowingcode:SQL>VARIABLEtask_nameVARCHAr2(255);SQL>VARIABLEsql_stmtVARC

evaluatethefollowingcode：SQL>VARIABLEtask_nameVARCHAR2（255）；SQL>VARIABLEsql_stmtVARCHAR2（4000）；SQL>BEGIN：sql_stmt：=’SELECtCOUNT（*）FROMcustomersWHERecust_state_province=’’CA’’’；：task_name：=’MY_QUICKTUNE_TASK’；DBMS_ADVISOR.QUICK_TUNE（DBMS_ADVISOR.SQLACCESS_ADVISOR，：task_name，：sql_stmt）；END；Whatistheoutcomeofthisblockofcode？（）

A.Itcreatesataskandworkload，andexecutesthetask.

B.Itcreatesataskandworkloadbutdoesnotexecutethetask.

C.Itproducesanerrorbecauseatemplatehasnotbeencreated.

D.ItproducesanerrorbecausetheSQLTuningSethasnotbeencreated.

参考A