In IT scenarios, which of the following are the power supply and distribution components of the FusionDC1000A?

The FusionDC1000A's power architecture for IT scenarios is an integrated system. It includes an Integrated UPS to provide conditioned, uninterruptible AC power. The Power PDB (Power Distribution Board) takes the output from the UPS and distributes it to the individual IT racks. The SmartLi, a lithium-ion battery system, serves as the energy storage component, supplying power to the UPS during a mains failure. These three components are integral to the power supply and distribution chain.

D. AC/DC power system: This is a high-level, generic term for the entire power train, not a specific component. The question asks for components, and options A, B, and C are the specific, named components that constitute the system.

- Huawei FusionDC1000A Prefabricated All-in-One Data Center Technical Proposal, Section: "Power Supply and Distribution System Architecture." This section details the key modules, explicitly naming the integrated UPS, SmartLi battery cabinets, and power distribution boards (PDBs).

- Huawei SmartLi UPS Solution White Paper, Section 2: "Solution Architecture." This paper describes how SmartLi integrates with Huawei UPS systems, which are the core of solutions like the FusionDC1000A.