Which of the following is industrial method for the manufacture of B₂H₆ ?

• A

  $4{\mathrm{BF}}_3+3{\mathrm{LiAlH}}_4\stackrel{\text{ Diethyl ether }}{⟶}2{ \mathrm{B}}_2{\mathrm{H}}_6+3\mathrm{LiF}+3{\mathrm{AlF}}_3$

• B

  $2{\mathrm{NaBH}}_4+{\mathrm{I}}_2\stackrel{\text{ Polyether }}{⟶}{\mathrm{B}}_2{\mathrm{H}}_6+2\mathrm{NaI}+{\mathrm{H}}_2$

• C

  $2{\mathrm{BF}}_3+6\mathrm{NaH}\stackrel{450 \mathrm{K}}{⟶}{\mathrm{B}}_2{\mathrm{H}}_6+6\mathrm{NaF}$

• D

  All of the above