题目问的是按照issuer的分类，可是结构化债券不属于按照issuer的分类（应该只有超国家、国家、公司那几个）吧？感觉结构化债券按照信用分级来分感觉更靠谱

问题如下：

When classified by type of issuer, asset-backed securities are part of the:

选项：

corporate sector.

structured finance sector.

government and government-related sector.

解释：

B is correct.

Asset-backed securities (ABS) are securitized debt instruments created by securitization, a process that involves transferring ownership of assets from the original owners to a special legal entity. The special legal entity then issues securities backed by the transferred assets. The assets’ cash flows are used to pay interest and repay the principal owed to the holders of the securities. Assets that are typically used to create securitized debt instruments include loans (such as mortgage loans) and receivables (such as credit card receivables). The structured finance sector includes such securitized debt instruments (also called asset-backed securities).