Final answer:
A secondary activity involves the processing of raw materials into finished goods, which is part of the secondary economic sector. A software developer, however, works in the quaternary sector, which deals with information processing and knowledge services.
Step-by-step explanation:
The question pertains to the classification of economic activities into different sectors. A secondary activity is defined as an activity that is involved in the processing of raw materials obtained by the primary sector into finished or semi-finished products. This is known as the manufacturing or secondary economic sector. Therefore, it does not qualify as a secondary activity in the context of the primary economic sector itself.
Software development, on the other hand, is not part of the secondary sector as it does not involve manufacturing or processing physical goods. Instead, software development is categorized under the quaternary economic sector activities, which deal with information processing and knowledge-based services. Hence, someone working as a software developer would be in the quaternary sector of an economy.