XYZ Wealth Management is managing a large-cap equity portfolio valued at $200 million. The firm has decided to undertake a rebalancing of the portfolio due to a new investment opportunity in a rapidly growing sector that was not previously included in the asset allocation. Given the current holdings, a 5% allocation to this new sector will require selling $10 million worth of the existing positions.

As a portfolio manager, you need to design an execution strategy for this rebalancing. Please discuss the key execution strategies that could be employed, taking into consideration factors such as market impact, trading costs, liquidity, and timing. In your response, provide a clear rationale for your choices, addressing the advantages and potential disadvantages of each approach.