Write the value of the $R_0$ constant used in the formula for the radius of a nucleus.
- A$1.1 \times 10^{-15} \ m$
- B$1.2 \times 10^{-15} \ m$
- C$1.5 \times 10^{-15} \ m$
- D$1.0 \times 10^{-15} \ m$
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