Consider the following statements regarding the structure of an immunoglobulin (antibody) molecule: 1. An antibody molecule consists of two identical light chains and two identical heavy chains linked by disulfide bonds. 2. The antigen-binding site (paratope) is formed by the variable domains of both the heavy and light chains. 3. The constant region of the heavy chain determines the class (isotype) and effector functions of the antibody. Which of the statements given above are correct?

Options:

• A: 1 and 2 only
• B: 2 and 3 only
• C: 1, 2 and 3
• D: 1 and 3 only

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