Which package configuration should you use?

You are developing a SQL Server Integration Services (SSIS) package that imports data into a data
warehouse hosted on SQL Azure. The package uses a Foreach container to process text files found in
a folder. The package must be deployed to a single server by using the Project Deployment model.
Multiple SQL Server Agent jobs call the package. Each job is executed on a different schedule. Each
job passes a different folder path to the package. You need to configure the package to accept the
folder path from each job. Which package configuration should you use?

A.
.dtsConfig file

B.
Registry Entry
C Environment Variable

D.
Parent Package Variable

E.
XML Configuration File

Explanation:
Reference:
http://msdn.microsoft.com/en-us/library/ms345179.aspx
http://msdn.microsoft.com/en-us/library/ms141708.aspx
http://msdn.microsoft.com/en-us/library/hh213214.aspx
http://msdn.microsoft.com/en-us/library/hh213296.aspx
http://msdn.microsoft.com/en-us/library/hh213293.aspx