Tom, a sole proprietor, is interested in implementing a retirement plan. He may have employees in the future. He also wants a plan that is easily understood, where the employees bear the investment risk, does not favor older participants, and allows elective deferrals. Which of the following plans is best suited to Tom's goals?

A$)$

Target benefit plan

B$)$

SEP plan

C$)$

Age$-$weighted profit$-$sharing plan

D$)$

SIMPLE IRA