An organization has detailed policies and procedures for dealing with safe handling for a variety of materials, including potentially hazardous materials. In order to maintain employee awareness, which of the following is MOST important? A. Reviewing and updating human resources reference materials regularly B. Ensuring that records are retained securely and for the required period of time C. Comparing the firm's safety performance to that of industry best practices D. Conducting ongoing training and posting safety data sheets (SDS) as needed