I think that the answer would be C
These antibodies are IgD.
It is a monomeric antibody isotype that is expressed in the plasma membranes of immature B-lymphocytes. It is also produced in a secreted form that is found in small amounts in blood serum. IgD is co-expressed with IgM on the surface of the majority of mature B cells prior to antigenic stimulation and functions as a transmembrane antigen receptor.
<span>1- attachment. attach to the cell mainly bacterial cell
.2-penetration. only nucleic acid is injected into the cell through the hole caused by the tail fibers and enzymes.
3- synthesis. replication of viral nucleic acid and protein and envelope
.4- assembly
<span>5- release.</span></span>
