Among the following, the correct statement (s) is (are)
A. Al`(CH_(3))_(3)` has the three-centre two-electron bonds in its dimeric structure
B. `BH_(3)` has the three-centre two-electron bonds in its dimeric structure
C. `AlCl_(3)` has the three-centre two-electron bonds in its dimeric structure
D. The Lewis acidity of `BCl_(3)` is greater than that of `AlCl_(3 )`
