Sammy's Sandwich Shop offers a soup, sandwich, and beverage combination at a special price. There are three sandwiches (turkey, tuna, and tofu), two soups (minestrone and split pea), and three beverages (coffee, milk, and mineral water) to choose from.

(a) Use the Fundamental Principle of Counting to determine how many different meal combinations are possible. (b) Construct a tree diagram, then list all possible soup, sandwich, and beverage combinations below.