Answer:
The statements which are true regarding the role an investment bank plays in the economy is both A and B .
Explanation:
Investment banks act as a bridge between the investors and large organizations, where one of the primary roles of these investment banks is to advise the businesses on how they can meet their financial challenges and by helping them in raising finance ( either through issuing stocks, bonds or even derivative products ) . Investment banks helps a company who is raising the funds through stocks and bond, by underwriting the securities. They help company's in merger and acquisitions.