What is the potential energy of a magnetic dipole in a magnetic field?

The potential energy of a magnetic dipole in a magnetic field depends on its orientation relative to the magnetic field.
The energy is expressed as a scalar product and is minimum when the magnetic moment is aligned with the magnetic field.
The energy difference between aligned and anti-aligned is given by the equation: ΔU = 2μBsinθ.
a) Only statement I is correct.
b) Statements I and II are correct.
c) Statements II and III are correct.
d) All statements are correct.