The correct option is 2, 3, and 6 only, as these reflect investments that directly improve agricultural infrastructure and support systems. Public investment in agriculture typically includes initiatives that enhance productivity and access to resources, such as the computerization of Primary Agricultural Credit Societies (option 2), which improves credit accessibility for farmers; social capital development (option 3), which fosters community cooperation and resource sharing; and setting up cold storage facilities (option 6), which helps reduce post-harvest losses and enhances market access. In contrast, fixes like Minimum Support Price (option 1) and loan waivers (option 5) are more about economic policy measures rather than direct public investment, while free electricity supply (option 4) is seen as a subsidy rather than an investment.