Interfascicular cambium and cork cambium are formed due to

Interfascicular cambium and cork cambium are formed due to Cell dedifferentiation.

The permanent tissue regenerate to become meristematic layer by the process called Cell dedifferentiation.

Cell differentiation – is the process which lead to maturation of cells.

A differentiated cell can regain its capacity for cell division under certain conditions. This phenomenon is called dedifferentiation.

A dedifferentiated plant cell once again loses its capacity to divide and becomes mature. This phenomenon is called redifferentiation.

Hence the correct answer is option (c).