Which of the following is taxable income?

Alimony received in accordance with a divorce decree signed prior to December 31, 2018. No changes have been made to the agreement.

Child support payments received in accordance with a divorce decree signed prior to December 31, 2018. No changes have been made to the agreement.

A noncash property settlement paid by a former spouse.

Payments made to maintain the taxpayer's primary residence, made by a former spouse who still owns the property.