The following complex ions absorb in the ultraviolet-visible region of light. Which one of these shows violet colour?
[$\text{CoCl}(\text{NH}_3)_5$]$^{2+}$, [$\text{Co}(\text{H}_2\text{O})(\text{NH}_3)_5$]$^{3+}$, [$\text{Co}(\text{NH}_3)_6$]$^{3+}$, and [$\text{Co}(\text{CN})_6$]$^{3-}$

Question

The following complex ions absorb in the ultraviolet-visible region of light. Which one of these shows violet colour? 
[$\text{CoCl}(\text{NH}_3)_5$]$^{2+}$, [$\text{Co}(\text{H}_2\text{O})(\text{NH}_3)_5$]$^{3+}$, [$\text{Co}(\text{NH}_3)_6$]$^{3+}$, and [$\text{Co}(\text{CN})_6$]$^{3-}$

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[$\text{CoCl}(\text{NH}_3)_5$]$^{2+}$

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