Which of the Following Characteristics Is Common to Both T-Cell

Which of the following characteristics is common to both T-cell receptors and immunoglobulins?

A) Somatic recombination of V,D,and J segments is responsible for the diversity of antigen-binding sites.
B) Somatic hypermutation changes the affinity of antigen-binding sites and contributes to further diversification.
C) Class switching enables a change in effector function.
D) The antigen receptor is composed of two identical heavy chains and two identical light chains.
E) Carbohydrate,lipid,and protein antigens are recognized and stimulate a response.