`Operation Flood`, launched in 1970, is one of the largest rural development programs in the world, designed to create a nationwide milk grid in India. It aimed to increase milk production, augment rural income, and, most importantly, provide fair prices to consumers thus ensuring that operations are self-sustaining.

Option 1: The Green Revolution refers to agriculture improvement initiatives that increased agricultural production globally, particularly in the developing world, starting most markedly in the late 1960s.

Option 2: The White Revolution refers to a major milestone in India that transformed the dairy industry and converted India from a milk-deficient nation into the world`s largest milk producer. This revolution was carried out by Operation Flood, hence, the correct answer.

Option 3: The Blue Revolution refers to the intensive farming of aquatic resources, most notably fish and other seafood, for human consumption.

Option 4: The Yellow Revolution refers to the increase in the production of oilseeds, particularly mustard and sunflower, in India during the 1980s and 1990s.

Each of these terms refers to a significant shift in their respective areas.