（单选题）
While designing your database， you have created the EMPLOYEES table as an index-organized table （IOT）. You want to create a bitmap index on the JOB_ID column to make queries faster. Which task must have been completed so that you are able to create the bitmap index？（）
AA primary key must have been created.
BA mapping table must have been created.
CAn overflow tablespace must have been specified.
DThe PCTTHRESHOLD option must have been specified.
正确答案
答案解析
略
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