What is a self-insured health plan, and how does it typically manage employee health insurance claims costs?

A) A plan that relies on external insurance companies for all health claims costs.
B) A plan where employees individually pay for their health insurance claims.
C) A plan that accumulates funds to cover all employee health insurance claims costs, with a top-off reinsurance policy to pay for excessive claims.
D) A plan that exclusively uses government-funded insurance for employee health claims costs.