Final answer:
The term 'Benefit period' best describes the maximum length of time that disability income benefits will be paid to the disabled insured.
Step-by-step explanation:
The term that best describes the maximum length of time that disability income benefits will be paid to the disabled insured is D. Benefit period. This term specifically refers to the duration for which the disability insurance will provide income benefits to the policyholder. It is distinct from A. Disability period, which can refer to the actual time an individual is disabled, and B. Elimination period, which is the waiting period between the onset of a disability and the commencement of benefit payments. Finally, C. Coverage period typically relates to the entire duration of the insurance policy's validity, not just when benefits are being paid.