What is the best interpretation of the following statement?

“Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall existed within the United States, or any place subject to their jurisdiction.”

Slavery and involuntary servitude is subject to the jurisdiction area.

Slavery is a punishment for a crime.

Amendment 13

Slavery and involuntary servitude is outlawed except as a punishment for a crime in which the person has been convicted.