Assertion (A) : Beryllium and aluminium forms ${\mathrm{BeF}}_4^{2-}$ and ${\mathrm{AIF}}_6^{3-}$
Reason (R) : Both ${\mathrm{Be}}^{2+}$ and ${\mathrm{Al}}^{3+}$ have almost same ionic radius
The correct option among the following is