1. Consider the following relational schema of a corporate database for a coalition of retail stores. These tables maintain information about stores, products, and the inventories of products in different stores with following attributes: Store (StoreID, StoreName) Product (ProductName, UnitPrice) Inventory (ProductName, StoreID) Write down the following queries in relational algebra: a) Return the name of the stores that have at least one product in their inventories whose unit price is greater than $2. b) Return the name of the products with the highest unit price