Ivan owes a balance due on his 2021 federal income tax return. All of the following, except one, must be true for him to qualify for a guaranteed installment agreement. Which of these is NOT required?

a) He has filed all returns for the past five years on time and paid all income tax due.

b) He agrees to pay the bill within three years and complies with the tax laws while the agreement is in effect.

c) He has not had an installment plan in the past five years.

d) The amount he owes exceeds $50,000.