Which of the following statements is TRUE? (i) In the 1980s, Medicaid started paying hospitals using Diagnostic Related Groups (DRGs), which are fixed prices paid for patients according to the diagnosis under which they are admitted. (ii) In the 1980 s, Medicare started paying hospitals using Diagnostic Related Groups (DRGs), which are fixed prices paid for patients according to the diagnosis under which they are admitted. (iii) In the 1980 s, the use of cost containment programs and the shift to outpatient care lowered hospital occupancy rates. (iv) Preferred Provider Organizations (PPOs) include only physicians and hospitals willing to discount their prices, and include patient incentives to use these lower cost providers. (i). (iit) and (iv), only?