The correct options are
A B2H6 is non-planar
B B2H6 is e− deficient
D B2H6 has two 3C−2e− bond
Diborane is non-planar molecule as each B atom has tetrahedral geometry.It is electron deficient molecule as each B atom has only 6 valence electrons. It contains two 3C−2e bonds.
Thus, all the options are correct.