Which configuration type should you use?

You are designing a SQL Server Integration Services(SSIS) package configuration strategy.
The package configuration must meet the following requirements:
Include multiple properties in a configuration.
Support several packages with different configuration settings.You need to select the appropriate configuration.
Which configuration type should you use? To answer,select the appropriate option from the drop-down list in
the dialog box.

A.
XML configuration file

B.
Environment variable

C.
Registry entry

D.
Parent package variable

E.
SQL Server