Final answer:
A clinic with volunteer doctors and nurses is categorized under Primary Care, providing initial healthcare services. A software developer works in the Quaternary sector, which pertains to information technology and research and development.
Step-by-step explanation:
A clinic run by volunteer doctors and nurses typically provides initial, general healthcare to patients and falls under Option 1: Primary Care. Primary care services are the first point of contact for individuals seeking medical attention. It includes general practice, preventive services, and the management of common health problems. By contrast, secondary care involves specialist services, often after a referral from a primary care provider. Tertiary care is specialized consultative healthcare, typically for inpatients and on a referral from primary or secondary medical care personnel, while quaternary care is an extension of tertiary care in reference to advanced levels of medicine which are highly specialized and not widely accessed.
Regarding the sector of the economy for a software developer, this profession would be categorized as Option D: Quaternary. The quaternary sector is a subset of the tertiary sector and includes services such as information technology, information generation and sharing, media, and research and development. Software development fits well within this sector as it encompasses the creation, design, and maintenance of software programs and systems, which are integral parts of the information and technology services industry.