Which antibody has the shape of a pentamer,or 5-sided arrangement?

Name: Which antibody has the shape of a pentamer,or 5-sided arrangement?
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Question

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IgM antibodies have a pentameric structure, meaning they have five subunits, which are connected by a J chain. This arrangement allows them to bind to multiple antigens at once, making IgM effective in the early stages of an immune response. The other antibody choices, IgA, IgD, and IgG, have different structures - IgA is dimeric, IgD and IgG are monomeric.

Which Antibody Has the Shape of a Pentamer,or 5-Sided Arrangement