Final answer:
Both defined contribution plans and defined benefit plans can be integrated with Social Security. These include plans like 401(k)s and pensions that align with Social Security benefits for retirement. The correct option is D.
Step-by-step explanation:
The category(ies) of qualified retirement plans that can be integrated with Social Security include both defined contribution plans and defined benefit plans. Defined contribution plans, such as 401(k)s and 403(b)s, involve fixed employer contributions to the worker's retirement account and are complemented by employee contributions.
These plans are tax-deferred, portable, and invest in a range of vehicles. Conversely, defined benefit plans, although increasingly rare, promise a specified monthly benefit upon retirement. Both types of plans may be set up to integrate with Social Security, offering coordinated retirement benefits.