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Which of the following pairs has the same size?
(a) \( \mathrm{Fe}^{2+}, \mathrm{Ni}^{2+} \)
(b) \( \mathrm{Zr}^{4+}, \mathrm{Ti}^{4+} \)
(c) \( \mathrm{Zr}^{4+}, \mathrm{Hf}^{4+} \)
(d) \( \mathrm{Zn}^{2+}, \mathrm{Hf}^{4+} \)
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