A food court has a row of four locations available for food vendors. The food court manager must decide which of four food vendors should be assigned which loca- tions. Technically, any food vendor could be assigned any one of the four locations. The four food vendors who wish to rent locations are: Pops Are Us, Taco Madness, Ice Cream Scream, and Mega Pretzel. Theoretically, how many different possible layouts does the developer have available to consider?