Which food production system is characterized by having separate facilities for production and service?

The commissary food production system is distinguished by its use of separate facilities for production and service. In this system, food is prepared in a central kitchen or facility where large quantities of food are made. This centralization allows for efficiency in food preparation, resource use, and cost management. Once the food is produced, it is then transported to various service locations where it is served.

This model contrasts with others like the conventional system, where food is typically prepared and served in the same location. The delivery system primarily focuses on transporting prepared meals from a central kitchen without the notion of a dedicated facility for production and service. The assembly serve system involves meal components prepared elsewhere being assembled rather than produced on-site, which also does not align with the idea of distinct production and service facilities.

Hence, the commissary system's structure, involving dedicated spaces for production and a separate setup for serving, makes it the correct answer.