The answer is letter D. Lengthy Legal Documents.
There is no need for legal documents that are signed with some lawyers to ensure that the program addressed all the needs of the employees in the company. There might be some consultation and documentations required, but not in a form of legal documents. Feedbacks are very important so the company could know the insights of every employee working in the firm. Question and answer is also important because the company needs to answer to concerns by employees which they have encountered in the Feedback phase. Additional sources are needed as well, so that the employees could know their references and if the ethics program covered selected laws and issues.