多选题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?（）AThere may be a bottleneck in the application that additional hardware would not 

There may be a bottleneck in the application that additional hardware would not solve.

Adding more hardware is costly and time consuming.

Adding hardware at the application layer may place additional load on an already overloaded database, network appliance, or storage system.

Adding more hardware may introduce new configuration requirements that need to be tested.