Aluminium chloride in acidified aqueous solution forms a complex 'A'. The formula of A and hybridisation state of $\text{Al}$ in 'A' is respectively:

1. A
   $[{\text{Al(H}}_2{\text{O)}}_6{]}^{3+},s{p}^3{d}^2$
2. B
   $[{\text{Al(H}}_2{\text{O)}}_4{]}^{3+},s{p}^3$
3. C
   $[{\text{Al(H}}_2{\text{O)}}_4{]}^{3+},ds{p}^2$
4. D
   $[{\text{Al(H}}_2\text{O)}{]}^{3+},d^{2}s{p}^3$