Which two statements show that metal M could have a proton number between 21 and 30? 1. It is able to conduct electricity. 2. It does not undergo reaction with water. 3. It produces two basic oxides with formulae $\text{MO}$ and $\text{M}_2\text{O}_3$. 4. It produces two coloured sulfates.
- A1 and 2
- B1 and 4
- C2 and 3
- D3 and 4