@Bhawna, Namra has answered correctly. Answers for remaining query are as follows.
FAD: Flavin adenine dinucleotide
FADH: When hydrogen gets attached with FAD. It is called FADH.
H stands for hydrogen. It is a semi reduced form of FAD. It is also called semiquinone.
@Namra, we really appreciate your contributions to this forum. Keep posting!!