Which of the following illustrates the Fischer projection of the product formed when D-mannose is oxidized at the C1 position?

Fischer projection of D-mannose oxidized at C1, showing hydroxyl and carboxyl groups.

Fischer projection of D-mannose with a hydroxymethyl group at C1, illustrating oxidation.

Fischer projection of D-mannose with hydroxyl groups, showing oxidation at C1.

Fischer projection of D-mannose oxidized at C1, featuring hydroxyl and carboxyl groups.