Homoleptic complexes among the following are

A) ${\mathrm{K}}_3\left[\mathrm{Al}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right],$
B) ${\left[{\mathrm{CoCl}}_2(\mathrm{en}{)}_2\right]}^{+}$
C) ${\mathrm{K}}_2\left[\mathrm{Zn}(\mathrm{OH}{)}_4\right]$

Addition of excess of ${\mathrm{AgNO}}_3$ to an aqueous solution of $1$ mole of ${\mathrm{PdCl}}_2·4{\mathrm{NH}}_3$ gives $2$ moles of $\mathrm{AgCl}$. The conductivity of this solution corresponds to: