Final answer:
President Barack Obama's role was in the tertiary sector, focused on service industry roles like public administration, while a software developer operates in the quaternary sector, dealing with knowledge-based services.
Step-by-step explanation:
President Barack Obama's role falls into the tertiary sector of economic activity. This sector is a part of the service industry and includes a diverse range of services like healthcare, education, finance, and public service. As a President, Obama was involved in managing national public services and policies, which are key aspects of the tertiary industry.
A software developer, on the other hand, would typically work in the quaternary sector of the economy. This sector focuses on the knowledge-based part of the economy, which includes services such as information technology, research and development, and other forms of knowledge and information management.