Management fails to mark marketable equity securities to fair market value as a risk under-investment. What internal control activity would best mitigate this risk? a. Qualified staff is responsible for end-of-period fair value The responsibility for authorization of purchases of securities should be separated from recording purchases in the securities ledger b. Broker transaction confirmations should be periodically reviewed by the investment committee of the board of directors c. The responsibility for authorization of purchases of securities should be separated from recording purchases in the securities ledger d. The investment committee of the BOD should regularly compare investment performance to expectations