Which of the following electronic configuration would be associated...

A magnetic moment is a quantity that represents the magnetic strength and orientation of a magnet or any other object that produces a magnetic field. More precisely, a magnetic moment refers to a magnetic dipole moment, the component of the magnetic moment that can be represented by a magnetic dipole. The greater the number of unpaired electrons, the higher will be the magnetic moment.

Magnetic moment$= \sqrt{n\left(n + 2\right)}$

$$\begin{array}{ll} & 3{d}^{7} & 3{d}^{8} & 3{d}^{3} & 3{d}^{6} \\ \text{No. of.} \\ \text{unpaired}{e}^{-}\end{array}$$3 2 3 4 $$\begin{array}{ll}\text{Spin only} \\ \text{Magnetic} \\ \text{moment}\end{array}$$ $$\begin{array}{ll}\sqrt{15} \\ BM\end{array}$$ $$\begin{array}{ll}\sqrt{8} \\ BM\end{array}$$ $$\begin{array}{ll}\sqrt{15} \\ BM\end{array}$$ $$\begin{array}{ll}\sqrt{24} \\ BM\end{array}$$$

Hence, the answer is option D.