Which plan places all investment decisions and risks with the employer?

The plan that places all investment decisions and risks with the employer is the Defined Benefit Pension Plan (DBPP). In a DBPP, benefits are predetermined based on a formula, typically taking into account factors such as salary and years of service, rather than being dependent on the performance of investments. As such, the employer is responsible for ensuring that there are sufficient funds to pay the promised benefits to employees upon retirement, which means that they bear the investment risk.

This structure provides employees with a more predictable retirement income, as their benefits are not affected by market fluctuations. The employer must manage those investments effectively to meet their future obligations but retains the control and responsibility over how those investments are allocated. In contrast, other plans like the Deferred Profit Sharing Plan (DPSP) or the Defined Contribution Pension Plan (DCPP) place more investment responsibilities and risks on the employees or in some cases share some responsibilities, which is why they are not the correct answer in this context.

In summary, with a DBPP, the employer fully controls the investment decisions and assumes the associated risks, making it the correct choice for this question.