问题如下：
Which of the following can securitize non-conforming mortgage loans?
选项：
A. Neither private enterprises nor state-owned enterprises.
B. Private enterprises.
C. State-owned enterprises.
解释：
B is correct.
Conforming mortgages meet the underwriting standards for inclusion as collateral for an agency RMBS such as those that are issued by government-sponsored firms. If a loan fails to satisfy the underwriting standards, it is called a "non-conforming mortgage", which can be securitized by private firms.
我的理解: Non conforming loan 是不满足underwriting standard的，（不满足三大行发型标准）。但是三大行通过spv打包结构化。这里为什么说是private firm呢？谢谢
