What is the expression for the axial field of a bar magnet for very large distances?

-\(\frac{μ_{o}}{4π} \frac{M}{r^{3}}\) \(\frac{μ_{o}}{4π} \frac{M}{r^{3}}\) -\(\frac{μ_{o}}{4π} \frac{2M}{r^{3}}\) \(\frac{μ_{o}}{4π} \frac{2M}{r^{3}}\)

\(\frac{μ_{o}}{4π} \frac{2M}{r^{3}}\)

The expression for the axial field of a bar magnet for very large distances : B = \(\frac{μ_{o}}{4π} \frac{2M}{r^{3}}\)