The outcomes of two tests on solution $X$ are displayed. When aqueous sodium hydroxide is added, a white precipitate forms and then dissolves in excess. When aqueous ammonia is added, a white precipitate forms and does not dissolve. Which ion is present in solution $X$?
- A$\text{Al}^{3+}$
- B$\text{Ca}^{2+}$
- C$\text{Cu}^{2+}$
- D$\text{Zn}^{2+}$