What is true about the table includes?CREATE TABLE includes$($ productid CHAR$(3)$ NOT NULL, tid VARCHAR$(8)$ NOT NULL, quantity INT NOT NULL, PRIMARY KEY $($productia$,$ tid$),$FOREIGN KEY $($productid$)$ REFERENCES product$($productid$),$FOREIGN KEY $($tid$)$ REFERENCES salestransaction$($tid$))$; The table includes columns which are optional All of the column datatypes are character The table has a composite primary key Rows are uniquely identified by productid