When picking an object up from the floor, what is the key to safe posture? (See 1.4 Self-care for manual handling). Question 5 options: 1) Maintain an s-shaped spine and keep the object close to your body. 2) Look down and pick up the object - your body is already supported. 3) Maintain a straight back and locked knees to pick up the object. 4) If the object is > 5kg, bend your knees