Natural killer cells are a part of immunity.

Statement (S): Natural killer cells form the body's most important cells of defence, and they destroy the infected cells or altered self cells in an antibody-independent manner.

Reason (R): The reaction time of NK cells is fast as they are always in an active form to identify and destroy even small cancer cells well before they form a tumor.

Which of the following is true?

Identify and write the names of given diagrams A, B, C and D.

Explain how plasma cells, such as the one shown in the above figure, are adapted to secrete large quantities of antibody molecules.

Calculate the diameter of the plasma cell in the above figure at its widest point.