All of the following are taken into account by the relational query optimizer to do its job except

All of the following are taken into account by the relational query optimierto do is job, except_ O the number of COUNT operations in the query the options available for performing join operations the number of rows of each table involved the knowledge of which base table attributes have unique values The earliest commercially viable DBMS approach was the approach data independent object-oriented hierarchical anomaly Prtse