Due to slow response times， a customer purchased additional memory. After the memory was installed，response time was not improved.  They complained to the pSeries technical specialist. Which of the following questions should be asked of this customer？（）

• A、Who recommended the memory purchase？
• B、Have more users been added since the memory purchase？
• C、Why were additional CPUs not ordered at the same time as the memory？
• D、Did a performance analysis of peak periods show a memory bottleneck？