Ferromagnetic materials show hysteresis in B - H characteristic. As the magnetic field in increased slowly from zero value, what is the first process which sets the material to give net magnetization?

• A. Growth of favourably oriented domains at the cost of other domains by reversible boundary displacements
• B. Growth of favourably oriented domains at the cost of other domains by irreversible boundary displacements
• C. Domain wall orientation
• D. A combination of processes (a) and (c) above