Which task would you perform before you run Oracle Universal Installer (OUI) in silent or suppressed mode for an installation?

Which task would you perform before you run Oracle Universal Installer (OUI) in silent or suppressed mode for an installation?

A.
Create the orainst.loc file

B.
Create the tnsnames.ora file

C.
Run the root.sh script

D.
Run the oraInstRoot.sh script