Among the complex ions given below which is/are outer-orbital’s complex –
$\begin{array}{l}\text{(I)}{\left[\text{Co}{\left(\text{CN}\right)}_6\right]}^{4-}\\ \left(\text{II}\right){\left[\text{Fe}{\left({\text{H}}_{\text{2}}\text{O}\right)}_{\text{6}}\right]}^{+2}\\ \left(\text{III}\right){\left[{\text{FeF}}_{\text{6}}\right]}^{3-}\\ \left(\text{IV}\right){\left[{\text{CoF}}_{\text{6}}\right]}^{3-}\end{array}$

• Correct answer
  A

  $\text{I}\text{I}, \text{I}\text{I}\text{I}, \text{I}\text{V}$
• B

  $\mathrm{I}\mathrm{I}, \mathrm{I}\mathrm{I}\mathrm{I }\mathrm{}\mathrm{o}\mathrm{n}\mathrm{l}\mathrm{y}$
• C

  $\mathrm{I}, \mathrm{}\mathrm{I}\mathrm{V }\mathrm{}\mathrm{o}\mathrm{n}\mathrm{l}\mathrm{y}$
• D

  $\mathrm{I}\mathrm{I }\mathrm{}\mathrm{o}\mathrm{n}\mathrm{l}\mathrm{y}$

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