Match the following columns:

Column I	Column II
a. Outer covering	1. Danielli Davson (1935)
b. Protoplasm	2. Ca and Mg pectates
c. Middle lamella	3. fluid content of cell
d. Sandwich or lamellar model	4. Cell wall and Cell membrane

A. a-2, b-3, c-4, d-1

B. a-4, b-3, c-2, d-1

C. a-1, b-2, c-3, d-4

D. a-3, b-4, c-1, d-2

Answer: Option B