Consider the following relational schema Product (Brand, Model, Type) PC (Model, CPU, Speed, RAM, HD, Price); Laptop(Model, CPU, RAM, HD, Screen Size, Screen Type, Price) Printer (Model, Colour, Price, Type) Assume that the model number is unique for each brand. Write the Following query into relational algebra: 0 Display the specification of a 15-inch dell Laptop. I) How many Samsung Colour printers are available in stock? (ii) Display all core i7 laptops. (iv) Display all core i5 and 16 GB RAM-based computers