What distinguishes N-linked glycosylation from O-linked glycosylation?

N-linked glycosylation involves attachment to DNA, while O-linked involves attachment to RNA.

N-linked glycosylation involves attachment to nitrogen, while O-linked involves attachment to oxygen.

N-linked glycosylation involves attachment to lipids, while O-linked involves attachment to proteins.

N-linked glycosylation involves attachment to oxygen, while O-linked involves attachment to nitrogen.