The correct option is 1 and 2 only. The Second Five-Year Plan (1956-1961) emphasized the development of heavy industries and aimed at substituting imports of basic and capital goods, reflecting a shift towards self-reliance and industrialization. The Fourth Five-Year Plan (1970-1974) indeed sought to rectify the concentration of economic power and wealth, implementing measures for more equitable distribution and regional development. However, the Fifth Five-Year Plan (1974-1979) did not mark the first inclusion of the financial sector; earlier plans had also considered financial sectors but failed to integrate them comprehensively as described. Thus, only statements 1 and 2 are correct. This understanding is essential for grasping India's economic policy evolution and the strategic objectives of its developmental phases as emphasized in UPSC preparatory materials.