Question 13 a You are an investor who tries to maximise the Sharpe ratio of your portfolio. You are considering using a robo-adviser to manage your investment portfolio. The robo-adviser you are looking at doesn't provide any details about its investment strategy. It charges a flat fee of $200 per year. What should you be concerned about? It sounds like a good deal. There is nothing to be concerned about o I should expect the robo-adviser to minimise variable costs, for example, by minimising the number of trades, which would likely lead to suboptimal portfolio allocations o I should expect the robo-adviser to maximise variable costs, for example, by maximising the number of trades, which would likely lead to suboptimal portfolio allocations