Find the odd one out with respect to differentiation.

Living differentiated cells, that by now have lost the capacity to divide, can regain the capacity of division under certain conditions. This phenomenon is termed as $.........$.

During differentiation of tracheary elements:

In the developing embryo, cells undergo changes in shape and function. This process is known as:

During differentiation,the cells undergo few to major structural changes in their

Explain in $2-3$ lines each of the following terms with the help of examples taken from different plant tissues.
$(a)$ Differentiation
$(b)$ De-differentiation
$(c)$ Re-differentiation