The electrical conductivities of two compounds, Y and Z, are given. Compound Y conducts electricity while in the liquid state, and it also conducts after being added to water. Compound Z does not conduct electricity in the liquid state, but it does conduct after being added to water. Identify compounds Y and Z.
- AY: $\text{Al}_2\text{O}_3$, Z: $\text{SiCl}_4$
- BY: $\text{NaCl}$, Z: $\text{Al}_2\text{O}_3$
- CY: $\text{NaCl}$, Z: $\text{SiCl}_4$
- DY: $\text{SiCl}_4$, Z: $\text{Al}_2\text{O}_3$