Statement I: Insulin is a globular protein.
Statement II: It has two polypeptide chains with `21` and `30` amino acids joined by sulhur bridges connecting cysteine amino acid on the two chains.
A. Statement `I` is true, Statement `II` is true, Statements `II` is the correct explanation of Statement `I`.
B. Statement `I` is true, Statement `II` is true, Statement `II` is not the correct explanation of Statement `I`.
C. Statement `I` is true, Statement `II` is false.
D. Statement `I` is false, Statement `II` is true.