Explanation:

- Option 1: Increasing numbers of workers are employed in the service sector.

- Postindustrial societies focus on service industries such as finance, education, and healthcare.

- Option 2: Changes are accompanied by the knowledge explosion based on the creation, processing, and distribution of knowledge.

- These societies emphasize innovation and the dissemination of information.

- Option 3: Economic self-sufficiency is displaced by complex divisions of labor, exchange relationships, and national and international market systems.

- There is increased interdependence and global trade.

- Option 4: All are correct.

- This option encapsulates all characteristics listed above.