Diborane

Given below are the statements about diborane (a) Diborane is prepared by the oxidation of NaBH_(4) with 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-