TaiShan 200 2280 power supply module, which of the following statements is correct?

TaiShan 200 2280 power supply module, which of the following statements is correct?
A . Need to guide customers to dual power supply configuration
B . The power supply models in the same server must be the same
C . Optional AC input and DC input
D . There are two types of AC power: 900W and 2000W

Answer: A,B,C,D