Frank Owns Three Deli Shops in Town

Multiple Choice

Frank owns three deli shops in town. Employees are awarded gift cards for adhering to standards set forth for sandwich preparation and shop cleanliness. In order to reinforce the standards he has set forth, Frank makes inspections of each shop at random times. This is an example of

A) a continuous interval schedule.
B) a variable interval schedule.
C) a fixed ratio schedule.
D) a variable ratio schedule.