Based on your understanding of annuities, answer the following questions.

Which of the following statements about annuities are true? Check all that apply.

Annuities are structured to provide fixed payments for a fixed period of time.

When equal payments are made at the beginning of each period for a certain time period, they are treated as an annuity due.

When equal payments are made at the beginning of each period for a certain time period, they are treated as ordinary annuities.

An ordinary annuity of equal time earns less interest than an annuity due.