"A very large proportion of workers are engaged in other services in highly urbanized areas." With reference to the given statement choose the correct option.
I. Large scale urbanisation and industrialisation require more workers.
II. Historically, it is a sectoral shift in the economy of the country.
III. Percentage of female workers is relatively high in secondary sector.
IV. It is a shift of workers from farm-based to non-farm-based occupations.
