Which one of the following is not an International Human Rights

Which one of the following is not an International Human Rights Treaty?

International Covenant on Civil and Political Rights
Convention on the Elimination of All Forms of Discrimination against Women
Convention on the Rights of Persons with Disabilities
Declaration on the Right to Development
This question was previously asked in
UPSC CDS-1 – 2018
The Declaration on the Right to Development is not an international human rights treaty in the same legally binding sense as the others listed.
An international human rights treaty is a formal agreement between states that creates binding legal obligations upon ratification. The International Covenant on Civil and Political Rights (ICCPR), the Convention on the Elimination of All Forms of Discrimination against Women (CEDAW), and the Convention on the Rights of Persons with Disabilities (CRPD) are all examples of such legally binding treaties adopted by the United Nations. The Declaration on the Right to Development, adopted by the UN General Assembly in 1986, is a declaration, which is generally not legally binding in the same way as a treaty, although it holds significant political and moral authority and contributes to the development of international law.
Treaties like the ICCPR, CEDAW, and CRPD require states to ratify them and implement their provisions through national legislation. Declarations, while important statements of principles and aspirations, do not create direct legal obligations for states in the same manner.