Which of the following statements are correct? (Choose ALL that apply.) You must read the SDS before using a hazardous product even if you have read the supplier or workplace label. Employers must ensure that an SDS is available for every hazardous material at the worksite SDSS are optional for hazardous products used at a workplace. SDSS are written by the manufacturer or supplier of the product . SDSS tell you what the effects of exposure are, what first aid measures you should take , and when you should seek medical attention SDSS relay detailed hazard facts as well as instructions for the safe handling , storage , and transportation of hazardous materials .