Which of the following compound can produce Riemann's green with Co(NO₃)₂ solution?

$\begin{array}{l}\mathrm{ZnO}+\mathrm{CoO}⟶\mathrm{ZnO}\cdot \underset{ (\mathrm{Riemann}\text{'}\mathrm{sgreen}) }{\mathrm{CoO}}\left( \mathrm{or} {\mathrm{CoZnO}}_2\right)\\ {\mathrm{ZnSO}}_4\stackrel{\mathrm{\Delta }}{⟶}\mathrm{ZnO}\left(\mathrm{s}\right)+{\mathrm{SO}}_2\left(\mathrm{g}\right)+1/2{\mathrm{O}}_2\left(\mathrm{g}\right)\\ 3\mathrm{Zn}(\mathrm{OH}{)}_2\cdot {\mathrm{ZnCO}}_3⟶4\mathrm{ZnO}+3{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2\end{array}$