Explanation:

- Bureaucracy, co-operatives, and defense: These entities have structured systems, defined hierarchies, and formal regulations guiding their operations. They provide clear protocols and official procedures.

- Option 1: Social Organisation: Refers to the broader system of social relationships and structures in a society. It includes informal and formal organizational elements.

- Option 2: Formal Organisation: These are officially governed entities with structured rules and objectives. Examples include bureaucracies and cooperatives.

- Option 3: Informal Organisation: Comprises unofficial and spontaneous interactions within a workplace or social setup with no formal structure.

- Option 4: Modern Organisation: Refers generally to contemporary entities adapting to modern challenges, styles, and technologies.