A compound isolated from food shows a carbon backbone and multiple functional groups. Based on this chemical evidence alone, which classification is most appropriate?

Trace mineral, because any compound isolated in microgram quantities is classified as trace regardless of chemical composition which would require macromolecular analysis to refute.

Major mineral, because carbon-containing substances are typically required in amounts over 100 mg per day.

Mineral, because all dietary micronutrients are classified as minerals until tested in the body for function and storage.

Vitamin, because the presence of carbon indicates an organic compound.