You have a SharePoint Server 2010 server farm. You discover that SharePoint does not render
Microsoft Office Excel workbooks that are stored on a file server named Server1. You need to ensure
that SharePoint can render Excel workbooks that area stored on both Server1 and in SharePoint
sites. What should you do?

A.
Add a new trusted file location for Excel Services.

B.
Add a new service account for the SharePoint Server Search service.

C.
Modify the location settings In the default trusted file location for Excel Services.

D.
Modify the workbook properties in the default trusted file location for Excel Services.

Explanation:
BURGOS MNEMO: “Add a new trusted file location”
Plan external data connections for Excel Services
http://technet.microsoft.com/en-us/library/cc262899%28office.12%29.aspx#section6