Which of the following statements concerning employee contributions to a qualified plan (other than to a 401(k) plan) is correct?
A. Contributions of up to 50 percent of pay can be made if a plan allows voluntary employee contributions.
B. Employee contributions to a plan must comply with the top-heavy vesting schedule.
C. Voluntary contributions are not counted as annual additions under the limit of Code Sec. 415(c).
D. Voluntary employee contributions must satisfy a non-discrimination test.