According to the given figure,which of the following statements is incorrect?

• A
  The $2$ bridged hydrogen atoms and $2$ boron atoms lie in one plane.
• B
  Out of $6$ $B-H$ bonds,two bonds can be described in terms of $3$-centre-$2$-electron bonds.
• C
  Out of $6$ $B-H$ bonds,four bonds can be described in terms of $3$-centre-$2$-electron bonds.
• D
  The four terminal $B-H$ bonds are $2$-centre-$2$-electron regular bonds.