Match the cell of the immune system with its function.
| Column I | Column II |
|---|---|
| (a) B-lymphocyte | (i) Mediate cell-mediated immunity (CMI) |
| (b) T-lymphocyte | (ii) Produce antibodies |
| (c) Helper T-cells | (iii) Provide physiological barrier |
| (d) Stomach acid | (iv) Help B-cells produce antibodies |