Final answer:
A simplified employee pension (SEP) plan requires employer contributions on a nondiscriminatory basis. It cannot deny participation to any employee 21 years of age or older based on age and can be integrated with Social Security.
Step-by-step explanation:
A simplified employee pension (SEP) plan requires employer contributions on a nondiscriminatory basis. It cannot deny participation to any employee 21 years of age or older based on age. However, it can be integrated with Social Security. This means that the employer contributions to the SEP plan can be coordinated with the employee's Social Security benefits.