The Business Partner technical specialist is called to determine if the addition of host ports on an IBM System Storage DS8700 has improved users’ response times for an IBM System p server running SAP.  How can the improvement be verified（）

• A、check the output of the "vmstat" command on LINUX
• B、check the performance reports via Tivoli Storage Productivity Center for Data
• C、check the performance reports via Tivoli Storage Productivity Center for Disk
• D、check the output of the "iostat" command on AIX