The primary role of an investment bank like Fairchild is to facilitate mergers and acquisitions (M&A) and assist corporations in raising capital by issuing debt or equity. Investment banks serve as intermediaries between investors and those in need of capital. They provide the expertise and knowledge required to structure and execute complex financial transactions, including M&As and public offerings.

A is incorrect. While some investment banks do have brokerage divisions that cater to large institutional investors, acting as a broker is not the primary role of an investment bank. Brokerage is just one of the many services provided by investment banks.

B is incorrect. Providing insurance policies against financial and operational risks is typically the role of insurance companies, not investment banks. While some investment banks do engage in risk management consulting, they do not directly provide insurance policies.

D is incorrect. Offering short-term loans and accepting deposits are typically functions associated with commercial banks, not investment banks.