Which one of the following statements regarding operations on relations in a database is TRUE?Select one: a$.$ While the select and join operations are unary operations, the intersection and difference operations are binary operations b$.$ While the insert and delete operations are thaty sperations, the intersection and union operations are binary operationsc. While the select and update operations are unary operations, the project and join operations are pinaty operations.d$.$ While the insert and union operations are unary operations, the join and difference operations are binary operations.