Which set of operators represents the complete set for relational algebra?
(a)Union, Difference, Projection, Selection, Cartesian Product
(b)Selection, Cartesian Product, Projection, Union, Intersection
(c)Cartesian Product, Projection, Selection, Difference, Intersection
(d)Join, Union, Projection, Selection, Difference
(e)Difference, Projection, Selection, Join, Intersection.
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