题目内容：
根据下列材料，回答题：The purpose of the requirements definition phase is to produce a clear，complete，consistent，and testable（ 1 ）of the technical requirements for the software product.
During the requirements definition phase，the requirements definition team uses an iterative process to expand a broad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each（ 2 ）that it must meet.The starting point is usually a set of high-level requirements from the（ 3 ）that describe the project or problem.
In either case，the requirements definition team formulates an overall concept for the system and the defines（ 4 ）showing how the system will be operated，publishes the system and operation concept documents，and conducts a system concept review(SCR).
Following the SCR，the team derives（ 5 ）requirements for the system from the highlevel requirements and the system operations concept.Using structured or object-oriented analysis,the team specifies the software functions and algorithms needed to satisfy each detailed requirements.
请选择（ 1 ）处最佳答案：
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