Select valid reasons for IT performance issues that cannot be universally solved by adding more hardware：（）

• A、 adding hardware may exacerbate inefficiency， which can lead to over provisioning and lower utilization
• B、 performance may degrade due to bottlenecks such as database connections that won’t scale in lock step with other dimensions such as computing capacity or memory
• C、 both A and B are valid
• D、 neither A nor B are valid