Billy is making an ice-cream sundae.
He chooses one flavor of ice-cream, one syrup, and one topping.
* The ice-cream flavors are vanilla, chocolate, and pistachio.
* The syrup flavors are chocolate, strawberry, and caramel.
* The toppings are m&m's, peanuts, oreos, and gummy worms.
How many different sundaes can he make if he makes one choice from each category?