When it comes to system scalability, Scale Up and Scale Out are two typical extension modes. Which of the following statements about the two extension modes are wrong? (Multiple Choice)

When it comes to system scalability, Scale Up and Scale Out are two typical extension modes. Which of the following statements about the two extension modes are wrong? (Multiple Choice)
A . When Scale Up expand, focus on improving the performance of a single node, the entire system is easy to achieve performance bottlenecks
B . Cloud computing generally uses Scale Up mode to expand
C . When Scale Out expand, the number of nodes is increased, and the system performance is improved overall.
D . The traditional telecommunications industry generally uses the Scale Out mode for expansion.

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Answer: BD