Which of the following plans is not considered a retirement pension?

The correct answer is the Deferred Profit Sharing Plan (DPSP) because this plan is designed to allow employers to share profits with their employees, usually in the form of contributions made to a fund that is vested for employees after a certain period. While DPSPs can support retirement savings, they do not qualify as traditional pension plans in the same way that defined benefit and defined contribution plans do, which are specifically structured to provide a regular income upon retirement based on predetermined formulas or contributions.

Defined Benefit Pension Plans and Defined Contribution Pension Plans are specifically designed as retirement pension plans. The former provides a specific payout at retirement based on an employee's earnings and years of service, while the latter focuses on the defined contributions made by employees and employers, which grow over time based on investment performance. Pooled Registered Pension Plans (PRPPs) are also considered retirement plans because they are designed to accumulate funds for retirement while pooling the assets of multiple employers and employees.

In contrast, a Deferred Profit Sharing Plan does not guarantee a specific benefit at retirement and primarily functions as a profit-sharing mechanism rather than a typical pension plan. Therefore, it does not fall into the category of traditional pension plans, making it the correct answer to this question.