Which of the following statements are correct regarding Social Security's role in the financial security of retirees?

Widows are particularly dependent on Social Security.

Social Security is the primary source of retirement income for the majority of retirees today.

Social Security is one of many sources of retirement income that protects against inflation risk, market risk, and longevity risk for the average American retiree.

The role of Social Security in the lives of retirees is smaller than it has been in the past and is expected to continue to decrease.