Software Engineering Economy is an effective part of software engineering.Which of the following content is the research content 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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