There are three crusts to choose from: thin, regular, and pan. There are three toppings to choose from: pepperoni, sausage, and mushrooms. The tree diagram below shows the possible outcomes. Use the diagram to answer the questions. Crust Topping Outcome pepperoni (thin, pepperoni) thin sausage (thin, sausage) mushrooms (thin, mushrooms) pepperoni regular sausage mushrooms (regular, pepperoni) (regular, sausage) (regular, mushrooms) pepperoni (pan, pepperoni) pan sausage (pan, sausage) mushrooms (pan, mushrooms) (a) How many outcomes are there? outcome(s) (b) How many outcomes have both regular crust and mushrooms being chosen? outcome(s) (c) How many outcomes have thin crust or pan crust being chosen? outcome(s)