Anna Elleson Has Just Opened Her Plumbing Business in a Small

Anna Elleson has just opened her plumbing business in a small industrial park located within the boundaries of the city of Tempe,Arizona.Upon opening her plumbing business,Anna receives a notice from the landlord that her largest pieces of equipment (backhoes) may not be parked in the parking lot of the industrial park overnight.Anna asks why and the landlord explains that there is a restriction in her lease.The restriction against parking equipment in the complex is:

A) enforceable as a private law.
B) unenforceable unless a city zoning ordinance prohibits such parking.
C) an unconstitutional regulation of private property.
D) unenforceable unless signs are posted.