Refrigeration refers to space temperatures:

Refrigeration typically involves maintaining temperatures that are lower than ambient conditions in order to preserve food, manage industrial processes, or provide cooling in various applications. The concept of refrigeration is commonly associated with temperatures typically below normal room temperature, which is around 68°F to 72°F.

The option indicating below 60°F effectively encompasses a range of applicable refrigeration scenarios, as many refrigeration systems are designed to operate in environments where temperatures are significantly lower, typically below 50°F or even below freezing in certain contexts. By defining refrigeration as anything below 60°F, it includes the majority of typical refrigeration applications while ensuring flexibility for various settings and materials being preserved.

In contrast, the other options either refer to higher temperature ranges or very specific limits that do not comprehensively represent the general concept of refrigeration. This highlights the understanding that refrigeration is fundamentally about creating cooler environments to achieve desired thermal management outcomes.