How does NAD+ act as an oxidizing reagent?
◦ It accepts a hydride ion at the 4-position of its pyridinium ring.
◦ It accepts a proton at the 4-position of its pyridinium ring.
◦ It accepts a proton at the amide carbonyl group at the 3-position.
◦ It accepts a hydride ion at the amide carbonyl group at the 3-position.
◦ none of the above