Which of the following actions, proposed by management, would be the most effective to mitigate the risk of the organization entering into business with a supplier where a conflict of interest exists?

a. Implement a policy requiring employees to submit a disclosure statement indicating whether they have any material interests in a supplier that has been awarded a contract

b. Implement a competitive bidding process that requires the procurement department to select the low responsible bidder before awarding a contract

c. Implementing a monitoring process that requires the accounts payable department to verify that a supplied is on an approved vendor listing before payment is made

d. Implement a hotline where suppliers can call the compliance department to inquire about potential conflict of interest violation with former employees before placing a bid for work