4. (a) As a stockbroker, you have been approached by a client seeking to establish a diversified portfolio of domestic shares. After identifying the clients investment needs, you recommend the client use an exchange traded fund (ETF) to achieve her investment objectives. Explain to the client how an ETF will achieve the objective of a diversified share portfolio. (b) The client also wishes to gain an investment exposure to the international share markets. Is it possible to use ETFs to achieve this objective? Explain.