题目内容
（请给出正确答案）
[主观题]
Software Engineering Economy is an effective part of software engineering, which of the fo
llowing content is the research comtent of software engineering economy？
Ⅰ.Estimation of software development cost
Ⅱ.Earn & Cost analysis of software development
Ⅲ.Adjustment of software development progress
A．Ⅲ only
B．Ⅱ and Ⅲ
C．Ⅰ and Ⅱ
D．all
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