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 base directory.
• C、It creates the Inventory pointer file.
• D、It creates the Oracle user for installation.
• E、It modifies the Unix kernel parameters to match Oracle’s requirement.