What technology should be chosen by a pharmacist to make a li- quid dosage form, if it contains calcium gluconate?

Answer options

1. Dissolve in alkaline medium
2. Dissolve in water free of redox subsatances
3. Add equal amount of sodium chloride
4. Dissolve it in hot solvent or heat it up to full dissolution
5. First grind it to powder when it is dry or with small amount of solvent added