Maria is a portfolio manager for a diversified investment fund. She aims to maintain the target asset allocation of the fund, which is currently set at 60% equities and 40% fixed income. Due to recent market performance, the equity portion has risen to 70%, while fixed income has fallen to 30%. Maria is evaluating different rebalancing strategies to realign the portfolio with its target allocation.
Which rebalancing strategy should Maria consider that most effectively reduces portfolio risk while aligning with her investment objectives?