The correct answer is (a) HDR 2007.
The Gender Inequality Index (GII) is a composite measure of inequality between women and men in three key areas: reproductive health, empowerment, and economic activity. It was introduced in the 2007 Human Development Report (HDR) of the United Nations Development Programme (UNDP). The GII is calculated as a geometric mean of three indices: the maternal mortality ratio, the adolescent fertility rate, and the share of women in parliamentary seats. The GII ranges from 0 to 1, with higher values indicating greater inequality.
The GII is a useful tool for measuring gender inequality and tracking progress over time. It has been used by governments, international organizations, and civil society organizations to assess the status of women and to develop policies to promote gender equality.
The GII has been criticized for its focus on a limited number of indicators and for its failure to capture the full range of gender inequalities. However, it remains an important tool for measuring gender inequality and for tracking progress towards gender equality.
The other options are incorrect because they are the years of the Human Development Reports that were published after 2007.