According to Article 243ZD(2) of the Constitution, what is the minimum proportion of District Planning Committee members that must be elected by and from amongst elected members of Panchayats at the district level and Municipalities? 

Article 243ZD(2) provides that "not less than four-fifths of the total number of members of such Committee shall be elected by, and from amongst, the elected members of the Panchayat at the district level and of the Municipalities in the district in proportion to the ratio between the population of the rural areas and of the urban areas in the district." This constitutional mandate ensures that the District Planning Committee comprises predominantly elected representatives from local bodies, maintaining democratic legitimacy and grass-root participation in district-level planning. The remaining members (up to one-fifth) may include nominated members with expertise or experience in relevant fields.