What Is the Difference Between NAD⁺ and NADP⁺

What is the difference between NAD⁺ and NADP⁺?

A) Both transport electrons to the electron transport chain ETC) found on the inner mitochondrial membrane, but NADP⁺ transfers its electrons to the ETC at a higher energy level.
B) Both function as electron carriers, but NADP⁺ has a phosphate group and NAD⁺ does not.
C) NAD⁺ functions as a free energy source for cells, whereas NADP⁺ does not.
D) NAD⁺ functions as an electron transporter, whereas NADP⁺ does not.