Please choose the correct ending to complete the given sentence: Travel: [header] How to prevent traveler's diarrhea [title] Avoid drinking the tap water in developing countries. [step] The tap water in developing countries in central and south america, the middle east, africa, and asia may be contaminated with bacteria, parasites, and viruses. These can all cause traveler's diarrhea (td).

Ending1: If possible, prevent traveler's diarrhea with water that is not contaminated with dangerous bacteria. This will help to diminish the symptoms of traveler's diarrhea. Ending2: If you do use the tap water, take a few sips before you proceed to the bathroom to relieve the discomfort. [title] Take a shower before going to the bathroom. Ending3: When visiting these areas, only drink sealed, bottled beverages like bottled water, tea, soda, beer, wine, juice, and coffee. [substeps] If the seal has been broken, choose or ask for another bottle. Ending4: [substeps] Some countries perform acupuncture to help prevent traveler's diarrhea. Scientists have found that oysters and other fish may have beneficial interactions with td.

Answer format: ending1/ending2/ending3/ending4