Given below are the statements about diborane.
\( (a) \) Diborane is prepared by the oxidation of \( \mathrm{NaBH_4} \) with \( \mathrm{I_2} \)
\( (b) \) Each boron atom is in \( sp^{2} \) hybridized state
\( (c) \) Diborane has one bridged \( 3 \) centre-\( 2 \)-electron bond
\( (d) \) Diborane is a planar molecule
The option with correct statement(s) is:
