The NITI Aayog`s SDG (Sustainable Development Goals) India Index uses a range of categories to classify the progress and performance of various States in India towards achieving their sustainable development goals. These categories include "Aspirants," "Performers," and "Achievers." Each of these categories represents a different level of progress. "Aspirants" are those that are just beginning their journey towards achieving their goals. "Performers" are making consistent progress, and "Achievers" are those that have made significant strides and achieved their goals. However, the category "Fast runners" does not exist in these classifications given by the NITI Aayog. Therefore, the correct answer is Option 3, "Fast runners". This category is not used in the SDG India Index, while the other three options are indeed categories used by the NITI Aayog in the Index.