Consider the following statements with regard to FCC structure:
1. Number of nearest neighbour atoms is twelve.
2. Packing efficiency is 0.74.
3. There is an atom at the body centre of the unit cell.
Which of the statements given above is/are correct?

A. 1, 2 and 3

B. 1 and 2

C. 2 and 3

D. 1 and 3

Answer: Option B