Figure out the correct sequence for the geometry of the given molecules  borazine, ${\mathrm{B}}_3{\mathrm{O}}_6^{3-}$, ${\mathrm{Fe}}_2{\mathrm{Cl}}_6$, trimer of $\mathrm{FCN}$.

Where $\text{'}\mathrm{P}\text{'}$ stands for planar and $\text{'}\mathrm{NP}\text{'}$ stands for non-planar.

Given below are two statements: one is labelled as Assertion $\mathrm{A}$ and the other is labelled as Reason $\mathrm{R}$.

Assertion $\mathrm{A}:$ In $\mathrm{T}l{\mathrm{I}}_3,$ isomorphous to ${\mathrm{CsI}}_3$, the metal is present in $+1$ oxidation state.

Reason $\mathrm{R}:$ $\mathrm{T}l$ metal has fourteen $\mathrm{f}$ electrons in its electronic configuration.

In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements: one is labelled as Assertion $\mathrm{A}$ and the other is labelled as Reason $\mathrm{R}$

Assertion $\mathrm{A}$: Boron is unable to form ${\mathrm{BF}}_6^{3-}$

Reason $\mathrm{R}$: Size of $\mathrm{B}$ is very small.

In the light of the above statements, choose the correct answer from the options given below