One of the purposes of a retirement plan is to accumulate retirement assets. Increases in retirement assets are a result of contributions by employers and employees as well as investment earnings on the retirement assets. Which of the following is correct regarding the investment management of retirement assets?

a. The primary reason that employees are given the right to self-direct plan assets is to empower them.

b. Employers can commingle assets from employees retirement accounts and have the assets manged by a third-party asset manager or manage the assets in-house.

c. Employers eliminate fiduciary responsibility by allowing employees to self-direct their retirement accounts.

d. The employer cannot manage assets in a 401(k) plan.