Final answer:
The New York Times article on the Rwanda genocide is a secondary source and a software developer would work in the tertiary or quaternary sector.
Step-by-step explanation:
The opinion article in the New York Times on the genocide in Rwanda 1994 would be considered a secondary source. This is because a secondary source is one that is written or created after the events being discussed have already taken place, often based on primary sources. They are critical for the evolution of historical knowledge and help provide context and scholarly research on a subject. Examples of primary sources include a diary entry or a letter from the period in question, which offer first-hand accounts of the events.
As for the sector of the economy in which a software developer would work, they would fall under the 'tertiary' sector, which includes services, or the 'quaternary' sector, which is concerned with intellectual services such as information technology.