g an exchange-traded fund (etf) is best described as: select one: a. a type of open-end fund that trades as a listed security on one of the stock exchanges. b. a professionally managed fund that requires accredited investors. c. a type of closed-end fund that trades as a listed security on one of the stock exchanges. d. a fund that operates with a fixed number of outstanding shares. e. a fund that allows you to trade funds informally online with other investors.