What does this script accomplish?

While running the Oracle Universal Installer on a Unix platform to install Oracle Database 10g
software, you are prompted to run orainstRoot.sh script. What does this script accomplish?

A.
It creates the pointer file.

B.
It creates the Inventory pointer file.

C.
It creates the Oracle user for installation.

D.
It modifies the Unix kernel parameters to match Oracle’s requirement.

E.
It creates the base directory.