One of your clients has done research into PQR Company that has led her to believe that the company's profits will be rising sharply over the next few years. As an elderly, conservative, strongly risk-averse investor, she wishes to benefit from this rise while taking the minimum possible risk. The company's capital structure shows that the following issues are outstanding: Class A common shares Series J participating preferred shares Series L retractable preferred shares Series M cumulative nonredeemable preferred shares. In which of these classes of shares should she invest to pursue her investment objectives? a) Series M cumulative nonredeemable referred shares. b) Series L retractable preferred shares. c) Series J participating preferred shares. d) Class A common shares