Which tool should you use?

You maintain a SQL Server Integration Services (SSIS) package. The package was
developed by using SQL Server 2008 Business Intelligence Development Studio (BIDS).
The package includes custom scripts that must be upgraded.
You need to upgrade the package to SQL Server 2012.
Which tool should you use?

A.
SSIS Upgrade Wizard in SQL Server 2008 BIDS

B.
SSIS Upgrade Wizard in SQL Server Data Tools

C.
SQL Server DTExecUI utility (dtexecui.exe)

D.
SQL Server dtexec utility (dtexec.exe)