The correct match of the order of the ions/elements for the given properties is/are
(i) ${\mathrm{Mn}}^{2+}<{\mathrm{Fe}}^{2+}<{\mathrm{Co}}^{2+}<{\mathrm{Ni}}^{2+}-$ Magnitude of hydration enthalpy
(ii) $\mathrm{Co}>\mathrm{Ni}>\mathrm{Fe}>\mathrm{Mn}-$ Atomic radii
(iii) ${\mathrm{Ni}}^{2+}<{\mathrm{Co}}^{2+}<{\mathrm{Fe}}^{2+}<{\mathrm{Mn}}^{2+}-$ Number of unpaired electrons