You develop a SQL Server 2008 Reporting Services (SSRS) report.
The report uses the “User!UserID” expression in a text box within the report header.
You need to ensure that data-driven subscriptions successfully execute for this report.
What should you do?

A.
Remove the expression from the report header.

B.
Configure the report to use no credentials.

C.
Configure the report to use stored credentials.

D.
Modify the expression in the report header as “User!UserName.”