Which of the following statements regarding ${\mathrm{Hg}}^{2+}$ (ionic radius 116 pm) and ${\mathrm{Ca}}^{2+}$ (ionic radius 114 pm) is correct?

${\mathrm{Hg}}^{2+}$ ion has less polarizing effect on an anion as compared to ${\mathrm{Ca}}^{2+}\text{ ion }$.

Both ${\mathrm{Hg}}^{2+}$ ion and ${\mathrm{Ca}}^{2+}$ have equal polarizing effect on an anion

${\mathrm{Hg}}^{2+}$ion has more polarizing effect on an anion as compared to ${\mathrm{Ca}}^{2+}\text{ ion }$

Both ${\mathrm{Hg}}^{2+}$ion and ${\mathrm{Ca}}^{2+}$ have no polarizing effect on an anion