You need to fix the PowerPivot data refresh problem by using the least amount of administrative effort.
What should you do?
A. Use the PowerPivot Configuration Tool and select the Upgrade Features, Services, Applications and Solutions option.
B. Use the PowerPivot Configuration Tool and select the Configure or Repair PowerPivot for SharePoint option.
C. Reinstall SSAS in PowerPivot for SharePoint mode by using the SQL Server 2012 installation media.
D. In SharePoint Central Administration, create a target application and configure the PowerPivot service application settings to use the target application.
