A vessel's fixed refrigeration system serves air conditioning, refrigerated cargo spaces, and reliquefaction of low-temperature cargo. A separate small self-contained refrigerator unit is also installed. Which statement correctly describes the applicability of 46 CFR Subpart 58.20?

1. A. The subpart applies to all refrigeration equipment on the vessel, including the small self-contained unit
2. B. The subpart applies only to the reliquefaction system because it handles low-temperature cargo
3. ✓ The subpart applies to the fixed systems for air conditioning, refrigerated spaces, and reliquefaction, but not to the small self-contained unitCorrect
4. D. The subpart applies only to cargo refrigeration and reliquefaction systems, not to air conditioning