DNA Is a Double-Stranded Nucleic Acid That Exists as a Double

DNA is a double-stranded nucleic acid that exists as a double helix. Which is responsible for holding the double helix of DNA together?

A) phosphodiester bonds between complementary base pairs on each strand
B) $\beta$ -N-glycosidic linkages between the sugar-phosphate backbone of each strand
C) disulfide bonds between the cysteine residues on each strand
D) hydrogen bonding between complementary bases on each strand