In $\beta$ Oxidation, Which Cofactor Is Required for the Conversion of a of a Trans-

In $\beta$ oxidation, which cofactor is required for the conversion of a trans- $\Delta$ ²-enoyl-CoA to a $\beta$ -hydroxyacyl-CoA?

A) NAD⁺
B) FAD
C) H₂O
D) CoA-SH
E) All of the answers are correct.