FOUR `2C-2e` BONDS and two `3c-2e` bonds. two `2c-2e` bonds and four `3c-2e` bonds. two `2c-2e` bonds and two `3c-2e` bonds. four `2c - 2e` bonds and four `3c-2e` bonds.
Solution :The DIBORANESTRUCTURE contains four `2c-2e(B-H)` bonds and two `3c-2e(B-H-B)` bonds.