You are loading a file into a database but the file name is unknown at design time and will have to be passed dynamicall

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You are loading a file into a database but the file name is unknown at design time and will have to be passed dynamically to a Package at run time; how do you achieve this?

A. Create a variable, use it in Topology at the File dataserver-level, and add it to a package as a Declare Variable step
B. Create a variable, use it in Topology at the File dataserver-level, and add it to a package as a Set Variable step
C. Create a variable, use it as the Resource Name of the File datastore, and add it to a package as a Declare Variable step
D. Create a variable, use it as the Resource Name of the File datastore, and add it to a package as a Set Variable step