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.
Answer: BD