The structure of diborane $(B_2H_6)$ contains :

Question

( A ) four $2C-2e^-$ bonds and two $3C-2e^-$ bonds
( B ) two $2C-2e^-$ bonds and four $3C-2e^-$ bonds
( C ) two $2C-2e^-$ bonds and two $3C-2e^-$ bonds
( D ) four $2C-2e^-$ bonds and four $3C-2e^-$ bonds