In which of the following complex while naming the complex, the suffix “-ate” is used after the name of the central metal ion

The suffix “-ate” is used after the name of the complex only in anionic complexes;Options 1,3 are cationic complexes whereas option 2 is a neutral complex;Only option 4 is an anionic complex;K3FeCN6⇌3K++FeCN6-3; Potassium hexacyanido ferrate(III) is its IUPAC name;