California's two-stage cooling rule for hot TCS food requires the food to pass through the danger zone within strict time limits. What are the correct limits?

Explanation

California Retail Food Code HSC §114002 requires cooked TCS food to be cooled from 135°F to 70°F within 2 hours, and then from 70°F to 41°F (or lower) within an additional 4 hours, for a total cooling time not to exceed 6 hours. The reason for the two-stage structure is that bacterial growth (Clostridium perfringens, Bacillus cereus, Staphylococcus aureus) is fastest between 70°F and 125°F, so the first 2-hour window is the critical kill of the rapid-growth zone; the slower 4-hour window covers refrigerator pull-down. Option A uses a single 4-hour rule which is the maximum for cold-holding non-compliance, not cooling. Option B is the FDA Food Code 2005 sequence (which is the same numbers but option D states the rule the way California's CRFC publishes it including the total). Option C eliminates the intermediate 70°F checkpoint and gives too much total time. Approved cooling methods include shallow pans (less than 4 inches deep), ice baths, ice wands, and blast chillers.