The correct answer is: C. a feasibility report
A feasibility report is a document that describes the potential for a new project or system. It assesses the technical, economic, and operational feasibility of the project, and identifies any risks or challenges that may need to be addressed.
The system investigation phase is the first phase of the systems development life cycle (SDLC). It is in this phase that the need for a new system is identified and assessed. The feasibility report is a key output of the system investigation phase.
A design report is a document that describes the detailed design of a new system. It includes information on the system’s architecture, components, and interfaces.
A requirement report is a document that describes the functional and non-functional requirements for a new system. It includes information on what the system should do and how it should do it.
While both a design report and a requirement report are important documents, they are not produced in the system investigation phase. The system investigation phase is focused on assessing the feasibility of a new system, not on designing or specifying the system.
Therefore, the correct answer is: C. a feasibility report