Final answer:
The Cybersecurity domain focuses on data security through the use of effective protective measures, while software developers typically work in the Quaternary sector, which is related to knowledge-based services such as information technology.
Step-by-step explanation:
The domain involved in optimizing data security by ensuring the implementation of effective tools, systems, and processes is c. Cybersecurity. Cybersecurity professionals work to protect computer systems from different types of cyber threats, unauthorized access, and data breaches. Their responsibilities include the installation of firewalls, data encryption, regular security audits, and promoting best security practices within an organization.
Regarding the sector of the economy where a software developer would work, the answer is d. Quaternary. The quaternary sector is part of the knowledge-based part of the economy which includes services such as information technology, software development, and research and development. Software developers create and maintain the software that runs on computers and other devices, which is a key component of this sector.