John is a portfolio manager responsible for the strategic asset allocation of a multi-million-dollar pension fund. The fund primarily invests in equities, fixed income, and alternative assets. Recently, due to anticipated volatility in equity markets, John is reevaluating the long-term asset allocation strategy. He is considering various theoretical frameworks, including mean-variance optimization, the Black-Litterman model, and a liability-driven investment approach.
Which of these asset allocation strategies would best align with the objective of achieving a balance between risk and return while accommodating the unique liabilities of the pension fund?