A. All of the answers are correct. Musculoskeletal Disorders or MSDs are injuries and disorders that affect the human body's movement the symptoms of this are joint or muscles pain,weakness, swelling, soreness, stiffness,numbness and more . There are hundreds of people especially those working in manufacturing company dealing with this painful injuries and possible surgery, prescription medications and all of the other side effects from this unnecessary experience. Most people with this kind of problem or symptoms never seek treatment and most recover on their own but the conditions can cause significant absence from work or lost productivity. With this common and costly problem people most need is prevention. Do the right thing , lower costs, improve productivity and efficiency.