The relationship between $\left[\mathrm{C}\mathrm{o}{\left(\mathrm{N}{\mathrm{H}}_3\right)}_4\mathrm{C}{\mathrm{l}}_2\right]\mathrm{N}{\mathrm{O}}_2$ and $\left[\mathrm{C}\mathrm{o}{\left(\mathrm{N}{\mathrm{H}}_3\right)}_4\mathrm{C}\mathrm{l}.\mathrm{N}{\mathrm{O}}_2\right]\mathrm{C}\mathrm{l}$ isomers is

• A

  Linkage
• B

  Geometrical
• Correct answer
  C

  Ionization
• D

  Optical

Hence, the correct answer is option: 'C'.