What should you do?

You have a computer that runs windows 7.
You have an application installation package named app1.msi.
You need to perform a customized installation of app1.msi.
What should you do?
A. Create a transform file named app1.mst and then run Msiexec.exe /i app1.msi /t app1.mst.
B. Create a transform file named app1.mst and then run Msinfo.exe /I app1.msi /t.
C. Create a transform file named app1.msp and then run Msiexec.exe /I app1.msi /app1.
D. Create a transform file named app1.msp and then run Msinfo32.exe /I app1.mst /.