Write a transaction to add a new product item of a certain type to a Product table. If the product type does not exist in a ProductType table, add it as well. Note: You can use arbitrary names for the tables and columns that you reference. Syntax can vary by RDBMS standard used; variations are permitted. Solution must include: a) ROLLBACK on failure of either INSERT b) COMMIT or END TRANSACTION c) SELECT statement to check for existence of a record prior to inserting