The pair(s) of complexes wherein both exhibit tetrahedral geometry is(are):\( (\text{Note: py = pyridine}) \)\( \text{Given: Atomic numbers of Fe, Co, Ni and Cu are } 26, 27, 28 \text{ and } 29, \text{ respectively} \)
\( [\text{FeCl}_4]^- \) and \( [\text{Fe(CO)}_4]^{2-} \)
\( [\text{Co(CO)}_4]^- \) and \( [\text{CoCl}_4]^{2-} \)
\( [\text{Ni(CO)}_4] \) and \( [\text{Ni(CN)}_4]^{2-} \)
\( [\text{Cu(py)}_4]^+ \) and \( [\text{Cu(CN)}_4]^{3-} \)