Final answer:
ERISA primarily regulates the management and vesting of established pension plans.
Step-by-step explanation:
The Employment Retirement Income Security Act of 1974 (ERISA) primarily regulates the management and vesting of established pension plans. It sets minimum standards for pension plans in the private industry and protects the interests of employee participants. ERISA requires employers to provide specific information about the plan to participants and establishes fiduciary responsibilities for those who manage and control the plan.