The sales team has just sold the first pSeries solution to a Windows NT customer.  
The team has identified concerns with a non-existent backup strategy and some workable environmental issues.  
In addition to these concerns，what other major concern should be considered？（）

The sales team has brought in the pSeries technical specialist to recommend the best solution to win the business.  
The customer wants the lowest purchase cost four-disk solution using an external I/O solution. 
Which of the following offerings provides the required base function at the lowest cost？（）