Final answer:
The Hadoop software framework is primarily used for processing large quantities of data, and a software developer typically works in the quaternary sector of the economy.
Step-by-step explanation:
The primary purpose of the Hadoop open-source software framework is b. Processing large quantities of data. Hadoop is designed to store and process massive datasets in a distributed computing environment. This framework utilizes a network of computers for reliable, scalable, and efficient data storage and analysis, making it ideal for big data applications.
Answering the question regarding the sector of the economy where a software developer would work, the correct answer is d. Quaternary. This sector includes knowledge-oriented services such as information technology, software development, research and development, and financial services. A software developer, who primarily deals with creating and maintaining software, clearly falls into this category of the economy.