John is a portfolio manager working for a wealth management firm. He is currently responsible for overseeing the asset allocation strategy of a client who is focused on achieving moderate growth while maintaining a balanced risk profile. The client's investment objectives include a five-year time horizon and a maximum acceptable volatility of 15% in their portfolio.
After assessing various asset classes, John considers implementing a 60/40 equity to fixed income allocation with a mix of domestic and international investments. However, he is concerned about potential interest rate hikes and their impact on bond prices. To adjust for this concern, John decides to allocate a portion of the fixed income allocation to short-duration bonds.
Which of the following strategies best describes John’s implementation approach to reduce interest rate sensitivity in the fixed income portion of the portfolio?