Which statement is true about the Oracle central inventory directory (oralnventory)?
A. oralnventory must not be shared by all Oracle software installations on a single system.
B. If ORACLE_BASE is set to /u01 /app/oracle for the oracle user during an installation, OUI creates the Oracle Inventory directory in the /u01 /app/oracle/ oralnventory path.
C. If an OFA-compliant path is not created and the ORACLE_BASE environment variable is not set during an Oracle Database installation, the Oracle Inventory directory is placed in the home directory of the user that is performing the installation.
D. Oracle software owners must be members of the same central oral nventory group, but they need not have this group as their primary group.
B is correct:
https://docs.oracle.com/en/database/oracle/oracle-database/12.2/axdbi/about-the-oracle-inventory-directory-and-installation.html#GUID-22CB62EF-D5DA-47BF-B4C3-C5D03B059728