Roland Corp. has hired Delta Investment Bank to underwrite its secondary public offering. Delta already has a sell recommendation on the stock given by its research unit to its brokerage and trading. Which of the following actions is most appropriate to avoid violating CFA Institute Standarc of Professional Conduct? a. Place the company on a restricted list and give only factual information about Roland. b. Change the rating from "sell" to "buy" because of its duty to clients. c. Use new research to substantiate that the stock deserves a buy rating