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B
Covalent bonds
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C
Disulphide bridges
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D
Amide formation
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Solution
The correct option is A Electrostatic intereactions Antibodies bind antigens through weak chemical interactions, and bonding is essentially non-covalent. Electrostatic interactions, hydrogen bonds, van der Waals forces, and hydrophobic interactions are all known to be involved depending on the interaction sites.
So, the correct answer is 'Electrostatic intereactions'.