Antibody
Self reactive antibodies are not found in significant concentration in normal serum because

self reactive B cells are killed by CD8 T cells
it is impossible to generate a self-reactive antibody
self reactive B cells switch to IgA which is all secreted and not present in serum
B cells that are stimulated via their surface bound antibody in the absence of T cell help to commit suicide

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Antibody
Which is not a function of IgG?

First antibody type produced against an antigen during the primary antibody response
Major antibody in serum
Involved in opsonization
Activates or fixes complement

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Antibody
The secretary component of sIgA is

formed by cleavage of an epithelial cell receptor used to transport the dimeric IgA across the epithelial cell
added to dimeric IgA by the M cell
made by T cells
made by plasma cells that secrete dimeric IgA

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