Huawei cloud computing system, which of the following value can virtual machine migration technology bring to customers? (Multiple choice)

Huawei cloud computing system, which of the following value can virtual machine migration technology bring to customers? (Multiple choice)
A . Reduce the customer’s business operating costs
B . Balancing the load on each physical server
C . Guarantee the high reliability of the customer system
D . Support hardware online upgrade

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Answer: ABC