3. Ron wants to make sandwiches for him and his friends. He has the following choices in breads whole wheat, multigrain, rye). He has these types of meat choices turkey, ham). He has these types of choices for vegetables lettuce, tomatoes). Finally, he has these choices for spreads (mayo, mustard]. If each sandwich has bread, spread, meat, and vegetable, how many possible combinations are there? Be sure to show your work.