The city of Winston in 2021 adopted a zoning ordinance regulating the location of adult businesses. The definition of an adult business is one that derives more than 50 percent of its revenues through the sale or rental of adult materials, be they books or magazines or films or videos, or sexual paraphernalia. Adult material is defined as matter that includes full-frontal nudity, representations of sexual or excretory functions, sexual perversions, and other sexual activities, and other similar kinds of matter. The same definition is used by other communities in the state and has been held to be constitutional when challenged in federal court. All enterprises that meet the definition of an adult business must be located within a five-square block area in downtown Winston. There are 15 such businesses in this area now, about the same number that existed before the zoning ordinance went into effect. Donald Quasar has rented a small warehouse in a business park in Winston and uses the space to make adult movies. The films are not obscene. They are shot and edited in the warehouse and then the movies are sent to a location in another state where they are copied, transferred to video, and distributed to buyers who order the films from an Internet catalog. Quasar has about 14 employees working at the warehouse. Occasionally, when a film is being shot, three or four actors are also at the site. The public is specifically excluded. This is a working film studio, not a retail outlet. The Winston city attorney has filed an order with Quasar declaring that his adult business must be located within the five square block area set aside in Winston for such businesses. If he fails to move the studio will be shut down for failing to be in compliance with the city zoning code. Quasar challenges the order, claiming that the law does not apply to his operation. a. What is the test a court would use to determine whether a city zoning law is constitutional? b. Would the Winston law apply to Quasar's studio?