Final answer:
The correct water temperature for the first sink is at least 212°F (100°C).
Step-by-step explanation:
The correct water temperature for the first sink should be at least 212°F (or 100°C) on the Fahrenheit (F) or Celsius (C) scales, respectively. This is the boiling point of water, which ensures that it is hot enough to effectively clean and sanitize the dishes.