Answer: Credit tranching.

**Explanation:** - **Option A (Time tranching)** is incorrect because time tranching refers to the creation of bond classes with different expected maturities, not the subordination structure. - **Option B (Credit tranching)** is correct. Subordination is a common form of internal credit enhancement in securitizations, where bond classes are divided into senior and subordinated tranches. Senior tranches have priority in receiving payments and absorbing losses, while subordinated tranches bear losses first. This structure is also known as a senior/subordinated structure. - **Option C (Prepayment risk management)** is incorrect because prepayment risk pertains to the uncertainty of cash flows due to borrowers altering payments, which is unrelated to credit tranching.

Author: LeetQuiz Editorial Team