Software Engineering Economy is an effecti
题型：单项选择题
问题：
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