Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to know if you have a stomach virus [title] Understand the symptoms of a stomach virus or flu. [step] This illness affects each area of the gastrointestinal tract. Its symptoms can include nausea and vomiting, diarrhea, abdominal discomfort, and general malaise.

Ending1: [title] Note any unexplained negative discomfort. [step] Despite symptoms' similarity to regular nausea and vomiting, never feel ill from this virus. Ending2: Symptoms include : [substeps] Nausea: queasiness or nausea, redness or sore throat. A feeling of fullness around the stomach, which may be something just a little beyond discomfort. Ending3: You may have one or all of the symptoms if you have a stomach virus. [substeps] The illness is self limited, meaning the virus usually runs its course in 2-3 days. Ending4: It is harder to diagnose if you have a stomach virus than if you have a flu. This ailment is usually classified as an infection.

Answer format: ending1/ending2/ending3/ending4