Consider the following statements for diborane 

$1.$  Boron is approximately $sp^3$ hybridized

$2.$  $B-H-B$ angle is $180^o$

$3.$  There are two terminal $B-H$ bonds for each boron atom

$4.$  There are only $12$ bonding electrons available

Of these statements

• A

  $1,\, 3$ and $4$ are correct

• B

  $1,\, 2$ and $3$ are correct

• C

  $2,\, 3$ and $4$ are correct

• D

  $1,\, 2$ and $4$ are correct