5. Which statement about the functions of O-linked and N-linked glycosylation is CORRECT?(A) N-linked glycosylation mainly controls the cytoskeleton, while O-linked glycosylation controls protein folding in the ER.(B) O-linked glycosylation promotes protein folding in the ER, while N-linked glycosylation is not needed for quality control.(C) N-linked glycosylation is essential for protein folding, ER quality control, and secretion, while O-linked glycosylation affects protein stability and cell interactions.(D) Both mainly serve as energy storage with little effect on protein function.(E) O-linked glycosylation sends misfolded proteins to the proteasome, while N-linked glycosylation mainly presents antigens.