Final answer:
The Database Administrator is responsible for defining the detailed database design.
Step-by-step explanation:
The role responsible for defining the detailed database design is the Database Administrator. The Database Administrator is the person who ensures the efficient operation of a database system and designs the structure and organization of the database. They are responsible for defining the schema, tables, relationships, constraints, and other details of the database.
A Software Developer is involved in creating software applications and may work with databases but is not primarily responsible for the detailed database design. A System Analyst is responsible for analyzing and evaluating the requirements of a system, including the database, but they do not typically define the detailed database design. A Project Manager oversees the planning, execution, and completion of a project, including the database design, but they do not have the specialized knowledge to define the detailed database design.