In this section, “county” means: Anne Arundel County; Frederick County; Howard County; Montgomery County; and Prince George’s County. Instead of a property tax credit, the governing body of a county may provide, by law, a grant to any eligible elderly or disabled renter. The governing body of a county may establish any qualification for the grant, including an income limit. The governing body of a county shall fund the grant from the appropriate county source. This section may not be construed to deny the governing body of a county the power to alter, amend, or repeal any law adopted under this section.