Which one of the following statements describes a difference between closed-end mutual funds and exchange-traded funds (ETFs)? Share prices of ETFs often differ substantially from the value of the fund's underlying assets ETFs are traded on exchanges, like stocks, while closed-end mutual funds issue new shares as money flows into the fund Closed-end funds typically have lower expense ratios than ETFs, but also lower average annual returns Closed-end funds contain mechanisms to avoid the premiums and discounts than ETFs experience Closed-end mutual funds are usually actively managed, while ETFs track an index