[A] include credit unions, savings and loan associations and commercial bank. The pension funds and insurance companies are called [B]. Mutual funds and hedge funds are [C]. Among financial intermediaries, [D] advise companies on securities to issue, underwriting security offerings, offer M&A assistance, and act as dealers in security markets. (fill the blanks from the following: contractual savings institutions; depository institutions; investment banks, finance companies; investment intermediaries)