I believe that the most common antibody switch is from IgM to IgG.
Class switching occurs by a mechanism called the class switch recombination binding. It is a biological mechanism that allows the class of antibody produced by an activated B cell to change during a  process known as isotype or class switching. The mechanism changes a B cell's production of antibodies from one form  to another, such as from the isotype IgM to the isotype IgG.
        
             
        
        
        
Answer:
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Explanation: