Storage systems are mainly expanded in two ways, Scale-Up and Scale-Out. Which of the following descriptions of these two expansion methods is wrong?

Storage systems are mainly expanded in two ways, Scale-Up and Scale-Out. Which of the following descriptions of these two expansion methods is wrong?
A . The Scale-Up model is mainly used in the cloud computing field
B . When using Scale-Out for expansion, management complexity will increase later
C . When using Scale-Out for expansion, the focus is on increasing the number of nodes
D . When using Scale-Up for expansion, the focus is on increasing the performance of a single node

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Answer: C