Under 2022 FDA Food Code 3-501.16(A)(2), what is the maximum cold-holding temperature for time/temperature control for safety food when none of that section's exceptions applies?

Where to look it up

https://www.fda.gov/media/164194/download

Why C is correct

The specified cold-holding limit is 41°F or less for the food. It is a maximum, not a required minimum refrigerator setting. The rule has exceptions, including specified raw-shell-egg storage; those are excluded by the question. Equipment air temperature must be managed to keep the food compliant.