Match the following columns:
Column-$I$ Column-$II$ $1.$ Saliva and tears $a.$ Cytokine barrier $2.$ Mucus coating $b.$ Cellular barrier $3.$ $PMNL$ $c.$ Physiological barrier $4.$ Interferons $d.$ Physical barrier
| Column-$I$ | Column-$II$ |
| $1.$ Saliva and tears | $a.$ Cytokine barrier |
| $2.$ Mucus coating | $b.$ Cellular barrier |
| $3.$ $PMNL$ | $c.$ Physiological barrier |
| $4.$ Interferons | $d.$ Physical barrier |
- A$1-c, 2-d, 3-b, 4-a$
- B$1-d, 2-c, 3-b, 4-a$
- C$1-c, 2-d, 3-a, 4-b$
- D$1-b, 2-c, 3-d, 4-a$
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