In a body-centered cubic $(BCC)$ unit cell of a metal,the edge length is $4 \times 10^{-10} \ m$. The diameter of the atom will be:
- A$3.46 \times 10^{-10} \ m$
- B$2 \times 10^{-10} \ m$
- C$1 \times 10^{-10} \ m$
- D$1.732 \times 10^{-10} \ m$
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