Dear Student,
Degree Of Freedon Is Defined as the no. of ways from which a particle can have energy.
In the case of BEE It can accure energy from both Translational and Rotational motion.
Hence The BEE Have 6 Degree of Freedom ( From Linear motion Along X,Y & Z Axes And From Rotational motion Along An Axis of rotation of XX'-axis, YY'-axis & ZZ'-axis).
Regards!