NO.PZ2023103101000027
问题如下：
Q. Which of the following types of infrastructure investments entails the lowest expected risk?选项：
A.Greenfield B.Brownfield C.Secondary stage解释：
The correct answer is C. In the three groupings of the infrastructure development cycle—greenfield, operational secondary stage, and brownfield—the operational secondary-stage assets with an existing track record of generating steady, bond-like cash flows possess the lowest risk and offer the lowest return to the investors. Brownfield investments, redevelopment of existing infrastructure, are incrementally riskier, and greenfield projects are the riskiest.
老师这个Secondary stage概念可以重新讲一下吗？谢谢
