Which is correct for the structure of diborane?

• A

   It contains four (2c,2e) covalent bonds and two (3c,2e) covalent bonds.

• B

  It contains three (2c, 2e) covalent bonds and three (3 c, 2e) covalent bonds.

• C

  It contains two (2c,2e) covalent bonds and four (3c,2e) covalent bond.

• D

  It contains six (2c,2e) covalent bonds.