While designing your database, you have created the EMPLOYEEStable as an index-organized (IOT). You want to create a bitmap index on the JOD_IDcolumn to make queries faster. Which task must have been completed so that you are able to create the bitmap index?()
A、A. A primary key must have been created.
B、B. A mapping table must have been created.
C、C. An overflow tablespace must have been specified.
D、D. The PCTTHRESHOLD option must have been specified.