Identify the outer orbital octahedral complexes among the following that have the same number of unpaired electrons:
(Atomic numbers of Mn, Fe, Co, and Ni are 25, 26, 27, and 28 respectively)
| (a) | (b) | ||
| (c) | (d) |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
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