An acid (A) reacts with a base (B) to produce the salt KNO₃. What are the most likely acid (A) and base (B) that formed this product?
1. A = HNO₃; B = KOH
2. A = HNO₂; B = Ca(OH)₂
3. A = HNO₂; B = KOH
4. A = HNO₃; B = Ca(OH)₂