JEE Chemistry Practice Question

The calculated spin only magnetic moments of $\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$ and $\left[\mathrm{CuF}_{6}\right]^{3-}$ in $\mathrm{BM}$, respectively, are (Atomic numbers of $\mathrm{Cr}$ and $\mathrm{Cu}$ are 24 and 29, respectively)

1. A.3.87 and 2.84
2. B.4.90 and 1.73
3. C.3.87 and 1.73
4. D.4.90 and 2.84