Which statement is the scientific rationale for administering an antacid to a client diagnosed with gastrointestinal reflux disease (GERD)?
1. Antacids neutralize the gastric secretions.
2. Antacids block H2 receptors on the parietal cells.
3. Antacids inhibit the enzyme that generates gastric acid.
4. Antacids form a protective barrier against acid and pepsin.
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