Among the following series of transition metal ions,the one where all metal ions have $3d^2$ electronic configuration is
- A$Ti^{4+}, V^{3+}, Cr^{2+}, Mn^{3+}$
- B$Ti^{2+}, V^{3+}, Cr^{4+}, Mn^{5+}$
- C$Ti^{3+}, V^{2+}, Cr^{3+}, Mn^{4+}$
- D$Ti^{+}, V^{4+}, Cr^{6+}, Mn^{7+}$
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