A is wrong: "Starting with Oracle Grid Infrastructure 12c Release 2 (12.2), Oracle ASM Filter Driver (Oracle ASMFD) cannot be installed and configured if Oracle ASMLIB has been installed on the system. If you want to install and configure Oracle ASMFD, you must first uninstall Oracle ASMLIB. "
OSASM and OSDBA are required, you can see it performing a grid install, step 5 of installation process. They can be configured to use the same OS group, but it must be a secondary group for grid owner.
I think BEF. both OSASM and OSDBA are not required. as explain here: https://docs.oracle.com/en/database/oracle/oracle-database/19/cwlin/example-of-creating-minimal-users-roles-groups.html#GUID-103186A1-74E0-42A8-AC3D-15AF833DCB40 you can install Oracle grid with only OSDBA (no separation of duties in this case).
B is correct because if server already has instances installed you must unset oracle_base. If server has no instances installed installer use oracle_base for installation.
Here the reference: https://docs.oracle.com/en/database/oracle/oracle-database/19/cwlin/grid-infrastructure-installation-and-upgrade-guide-linux.pdf
Agreed BEF
If you do not designate a separate group as the OSASM group, but you do define an OSDBA group for database administration, then by default the OSDBA group you define is also defined as the OSASM group.
User Environment Configuration Checklist for Oracle Grid Infrastructure
OUI creates an Oracle base and central inventory, and creates an Oracle inventory using information in the following priority:
–In the path indicated in the ORACLE_BASE environment variable set for the installation owner user account.
–In an Optimal Flexible Architecture (OFA) path (u[0199]/app/owner where owner is the name of the user account running the installation), if that user account has permissions to write to that path.
I think DEF as well.
D: https://docs.oracle.com/en/database/oracle/oracle-database/19/cwlin/about-oracle-installation-owner-accounts.html#GUID-39A48A63-E41F-4034-8C54-08D8E11A4F4C
as per documentation https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/database-installation-guide-linux.pdf oracle_base is UNSET and of couse a disk grup is created by oui at the end of process
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