A common approach to solve application performance issues is to add more hardware. Which two  reasons describe why this alone does not always solve performance problems?（）

• A、There may be a bottleneck in the application that additional hardware would not solve.
• B、Adding more hardware is costly and time consuming.
• C、Adding hardware at the application layer may place additional load on an already overloaded database, network appliance, or storage system.
• D、Adding more hardware may introduce new configuration requirements that need to be tested.