The correct answer is option 2: Convention on the elimination of all forms of discrimination against women. This international Human Rights Instrument has been signed by India but has not yet been ratified by the country.

A signature indicates a country`s intent to become a party to an international treaty, while ratification is the formal process by which a country gives legal effect to the treaty. Ratification generally involves passing domestic legislation or making constitutional changes to implement the provisions of the treaty.

The Convention on the elimination of all forms of discrimination against women, also known as CEDAW, is an important treaty that seeks to promote gender equality and eliminate discrimination against women. It covers various areas such as political and public life, education, employment, healthcare, and marriage and family life.

While India has signed CEDAW, it has not yet ratified the convention. Ratification requires the approval of the Parliament and may involve addressing any inconsistencies between the convention and Indian domestic laws. It is important to note that although India has not ratified CEDAW, it is still obligated to comply with other international human rights instruments and its own constitution, which provide protections for women`s rights.