The `Annapurna` Scheme, launched by the Government of India in April 2000, aimed to provide food security to a specific group of individuals. The correct option is option 3.

Option 1: Rural poor living below the poverty line - This option does not accurately describe the target group of the Annapurna Scheme. The scheme was not specifically designed for all rural poor individuals but for a specific category of individuals.

Option 2: Urban slum-dwellers living below the poverty line - This option also does not accurately describe the target group of the Annapurna Scheme. The scheme was not specifically designed for all urban slum-dwellers but for a specific category of individuals.

Option 3: Senior citizens not covered under National Old Age Pension Scheme - This is the correct option. The Annapurna Scheme was launched to provide food security to senior citizens who were not covered under the National Old Age Pension Scheme. This targeted group includes senior citizens who may not have access to a regular source of income and are in need of assistance to meet their nutritional requirements.

Option 4: Victims of natural calamities who are forced to migrate to other areas - This option does not accurately describe the target group of the Annapurna