The correct option is C IgA type
Colostrum is the first milk produced by a lactating mother after the parturition of the child. Colostrum is loaded with nutrients and immunity boosting compounds to support and protect the new-born in their first few days of their life. Among all other types of antibodies present in the body, IgA is the most predominant secretory antibody and is predominantly present in the colostrum. These are generally dimeric in nature. Dimer is a compound formed by the union of two radicals or two molecules of a simpler compound. It protects the infants from inhaled and ingested pathogens.