Features of immunoglobulins include all of the following, EXCEPT,      All immunoglobulins' constant regions include both heavy chains and both light chains     IgA is a dimerized immunoglobulin that can be part of a mucus membranes' secretions     All antibodies are secreted after the B cell becomes a plasma cell     All immunoglobulin classes have disulfide bridges connecting heavy chains in at least 1 spot     Immunoglobulins bind to antigens at the variable region only     Immunoglobulins can also activate innate immune cells to carry out host defenses

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A: