Give the name P, Q, R from given figure

• A. P - antigen binding site Q - Light constant region R - Non-variable rigon of Heavy Chain
• B. P - antigen binding site Q - Light constant region R - Variable region of Heavy Chain
• C. P - disulphide bond Q - antigen binding site R - variable region of heavy chain
• D. P - antigen binding site Q - antibody binding site R - sulphide bond