Among the complex ions,$[Co(NH_{2}-CH_{2}-CH_{2}-NH_{2})_{2}Cl_{2}]^{+},$ $[CrCl_{2}(C_{2}O_{4})_{2}]^{3-},$ $[Fe(H_{2}O)_{4}(OH)_{2}]^{+}$,$[Fe(NH_{3})_{2}(CN)_{4}]^{-}$
$[Co(NH_{2}-CH_{2}-CH_{2}-NH_{2})_{2}(NH_{3})Cl]^{2+}$ and $[Co(NH_{3})_{4}(H_{2}O)Cl]^{2+}$ the number of complex ion(s) that show(s) cis-trans isomerism is
