MCQ
Number of $\pi\ \text{bound}$ and $\sigma\ \text{bound}$ in the following structure is : 
- A$6, 19$
- B$4, 20$
- ✓$5, 19$
- D$5, 20$
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Assertion $(A)$ : Boron is unable to form $BF _{6}^{3-}$
Reason $(R)$ : Size of $B$ is very small.
In the light of the above statements, choose the correct answer from the options given below.