Explain quantitative on the basis of domain picture the reversibility of a ferromagnet?

Question

$\begin{array}{1 1} \text{Magnetization is removed when the external field is removed } \\ \text{Magnetization persists even when the external field is removed } \\ \text{Magnetization attains its peak value when the external field is removed } \\ \text{Magnetization attains its lowest value when the external field is removed } \end{array}$