Evaluating Bond Indexing for LDI Strategy

As a fixed income portfolio manager at a pension fund, you are considering implementing a liability-driven investment (LDI) strategy that incorporates a bond indexing approach. You are tasked with selecting the most appropriate indexing strategy for minimizing the risk of asset-liability mismatch in the context of your fund's long-term liabilities.

Your pension fund has significant liabilities that are sensitive to interest rate changes, particularly due to a large portion of its obligations being linked to long-duration fixed income products. You are evaluating various indexing options, including a duration-matched bond index and a total return bond index.

Which of the following indexing strategies would most effectively align with your objective of minimizing liability mismatch risk?