Answer:
NADH and FADH
Explanation:
An oxidizing agent is a chemical substance which has one among the three listed properties.
1. It can accept electrons.
2. It can remove hydrogen.
3. It can add oxygen to the reactant.
NAD+ and FAD+ serve as an oxidizing agent because they not only accept a pair of electron but also remove hydrogen. In this molecule, they have actually taken hydrogen from carbon where OH functional group was present and oxidizing that particular alcohol group to ketone. Please see the image attached.