Which of the following are incorporated in the 73rd Amendment of the Constitution?A. Zilla PanchayatB. Kshetra PanchayatC. Gram PanchayatD. Nagar NigamSelect the correct answer from the codes given below:

The $73^{\text{rd}}$ Constitutional Amendment Act of $1992$ introduced a uniform three-tier system of rural local self-government (Panchayati Raj) across India:Gram Panchayat at the village level.Kshetra Panchayat (Block Samiti) at the intermediate level.Zilla Panchayat (Zilla Parishad) at the district level.Nagar Nigam (Municipal Corporations) was incorporated under the $74^{\text{th}}$ Amendment Act, which focuses on urban local bodies. Therefore, A, B, and C are the correct options.