题目内容：
根据下面的文字资料回答题The purpose of the requirements definition phase is to produce a clear,complete，consistent，and testable（ 1 ）of the technical requirements for the software produet．During the requirements definition phase，the requirements deftnifion team uses an iterative process to expand a broad statement of the system requirements into a complete and detailed specificationof 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 thedefines（ 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 systern operations concept．Using structured or object-oriented analysis，the team specifies the software functions and algorithms needed to satisfy each detailedrequirements.文中（ 1 ）处正确的答案是（ ）。 A．function
B．definition
C．specification
D．statement
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