A customer is installing a new x3850 X5 server and has purchased a warranty upgrade on the server to 24 x 7 four hour response. The customer requested IBM help with setting up the RAID adapter. The customer was told IBM would not help them. Which of the following should be verified first？（）

• A、The customer used their IBM Customer Number
• B、The customer has activated their base warranty
• C、The customer purchased Remote Technical Support Servicepac
• D、The customer escalated the issue to the Duty Manager