Final answer:
Automatic enrollment in Medicare for individuals receiving Social Security benefits typically occurs for Parts A and B, unless coverage is deferred.
Step-by-step explanation:
For eligible consumers who are receiving Social Security benefits, enrollment in Medicare is generally automatic for Parts A and B, unless they choose to delay their coverage. Part A covers some hospital charges and is funded mainly through payroll deductions. Part B is optional, covering non-hospital medical expenses like physician services and outpatient visits, and requires a monthly fee. Both parts function as a form of social insurance, where regular payments secure the benefits for elderly and retirees. Therefore, the correct answer to the question is c Parts A and B.