In the Human Immune System, Each Antibody Molecule Consists of Four

In the human immune system, each antibody molecule consists of four polypeptide chains. Which of the following statements about these chains is CORRECT?

A) There are two identical heavy and two identical light chains.
B) Each chain has two different binding sites at its end.
C) Only the heavy chains have a variable region.
D) Epitopes are attached to the ends of the chains.
E) The antigen binding site is formed by the dimerisation of an $\alpha$ and a $\beta$ chain polypeptide.

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