Final answer:
The correct method to clear all syrup and beverage that has been in drink tower lines above ice level overnight is option 4: Discard the first 2 liters of beverage from each line and run water for 5 minutes.
Step-by-step explanation:
The correct method to clear all syrup and beverage that has been in drink tower lines above ice level overnight is option 4: Discard the first 2 liters of beverage from each line and run water for 5 minutes.
This method ensures that any leftover residue from the previous day is removed and replaced with fresh beverage and water. It is a hygienic practice to prevent contamination and ensure the quality of the beverages.
Using hot water, bleach, or manually cleaning the lines with a brush can be unnecessary and potentially harmful to the drink tower lines.