Which of the following components is optional for the UPS5000-E (25-75 kVA)? (Multiple Choice)

The UPS5000-A-400/500K has good scalability, supporting a maximum of 0 to De used in parallel.

As the construction cost of the equipment room is high, reducing the floor area can efficiently save investment for clients. The floor area of a UPS5000-A-500K is ().

The control unit of the UPS5000-A adopts 1+1 redundancy. A faulty control unit can be smoothly switched to the other, which can prevent the occurrence of single-point failures and improve the power supply reliability.

Which of the following modules in the UPS5000-E (50 kVA power module) support online hot replacements? (Multiple Choice)