What is the difference between a peptide bond and a disulfide bond?

What is the difference between a peptide bond and a disulfide bond?

• A. Peptide bonds link amino acids via phosphodiester bonds; disulfide bonds are ionic.
• B. Peptide bonds form between nucleotides; disulfide bonds link amino acids via peptide bonds.
• C. Peptide bonds link amino acids via amide bonds; disulfide bonds are covalent bonds between cysteine sulfur atoms stabilizing tertiary/quaternary structure.
• D. Peptide bonds store energy; disulfide bonds regulate solubility.

Answer: (C)