Final answer:
The option that does NOT require a variance and may require a HACCP plan is purchasing produce.
Step-by-step explanation:
The option that does NOT require a variance and may require a HACCP plan is c.) purchasing produce. HACCP (Hazard Analysis and Critical Control Points) is a system used to identify and control food safety hazards.
Smoking meats, ROP (Reduced Oxygen Packaging) processing, and packing juice on-site are examples of food processing activities that may require a HACCP plan and a variance. These activities involve potential food safety risks that need to be controlled and monitored to prevent foodborne illness.
It is worth noting that in recent years, advancements in sterilization and canning procedures have reduced the risk of botulism and other foodborne illnesses. However, the need for a HACCP plan and a variance depends on the specific regulations and requirements of the jurisdiction.