Question: Which of the following is fully exempt from tax: a. retirement plan benefits you receive based on your age, length of service, or prior contributions to the plan b. payments received as continuation of pay for up to 45 days under the Federal Employees' Compensation Act (FECA) while a claim is being decided c. payments received as sick pay under the Railroad Unemployment Insurance Act d. amounts received as workers' compensation for an occupational sickness paid under a workers' compensation act