Which of the following statements is/are correct regarding  ${\mathrm{B}}_2{\mathrm{H}}_6$ ?

Banana bonds are longer but stronger than normal  $\mathrm{B}-\mathrm{H}$ bonds

${\mathrm{B}}_2{\mathrm{H}}_6$ is also known as  $3\mathrm{c}-2\mathrm{e}$ compound

The hybrid state of B in ${\mathrm{B}}_2{\mathrm{H}}_6$ is ${\mathrm{sp}}^3$ while that of  ${\mathrm{sp}}^2$ in ${\mathrm{BH}}_3$

It cannot be prepared by reacting  ${\mathrm{BF}}_3$ with ${\mathrm{LiBH}}_4$ in the presence of dry ether