After a nasogastric (NG) tube has been inserted, the nurse can most accurately determine that the tube is in the proper place if which of the following can be demonstrated?
1. The client is no longer gagging or coughing.
2. The pH of the aspirated fluid is measured.
3. Thirty milliliters of normal saline can be injected without difficulty.
4. A whooshing sound is auscultated when 10 mL of air is inserted.
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