Which of the following statements is not correct about diborane $(B_2H_6)$?
- AThe four terminal $B-H$ bonds are two-centre-two-electron bonds.
- BThe four terminal hydrogen atoms and the two boron atoms lie in one plane.
- CBoth the boron atoms are $sp^2$ hybridized.
- DThere are two $3$-centre-$2$-electron bonds.
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