Final answer:
Defined benefit plans are generally administered by the Benefits department, which specifically manages such plans and ensures compliance with legal obligations like contributions to the Pension Benefit Guarantee Corporation.
Step-by-step explanation:
The defined benefit plans are typically administered by the Benefits department within a company. While the Human Resources department may oversee many aspects related to employment, including benefits, it is usually the specific Benefits department that deals directly with the administration of benefit plans such as pension insurance and other retirement and savings plans. Companies offering pensions are also obligated to contribute to the Pension Benefit Guarantee Corporation to ensure at least some pension benefits are secure in the event of bankruptcy.