Write each of the queries in Datalog. You should use only safe rules, but you may wish to use several IDB predicates corresponding to subexpressions of complicated relational-algebra expressions. This must be completed in DATALOG, and use IDB predicates.

Relation Schema:

Product(maker, model, type) PC(model, speed, ram, hd, price) Laptop(model, speed, ram, hd, screen, price) Printer(model, color, type, price) Questions: a) What PC models have a speed of at least 3.00? b) Which manufacturers make laptops with a hard disk of at least 100GB? d) Find the model numbers of all color laser printers.