What of the following statements best describes an "Angel Investor"?\ a. A person with an extensive knowledge of business who is hired by a company to take over management in very poor circumstances.\ b. A philanthropic benefactor of a firm who supports the firm with cash injections to enable it to pursue goals other than shareholder wealth mamization.\ c. A friendly firm which agrees to a merger with a company so that a competitor cannot take control of that company.\ d. Any early stage investor who invests in businesses with a social mandate.\ e. A wealthy individual with substantial business and entrepreneurial experience, who invests primarily in start-up, early stage or expanding firms.