Which of the following statements rightly explains the term ‘federalism’?
(a) It is a political system characterized by the division of power between the two Houses of Union Legislature. (b) It is a political system that involves giving dual citizenship to citizens compulsorily. (c) It is the system of having an elected and non-hereditary Head of the State. (d) It is a system of government in which power is divided between a central authority and various constituent units of the country.