Which two are true about OS groups and users for Oracle Grid Infrastructure and the Oracle Relational Database Management System (RDBMS)? (Choose two.)
A. By default, members of the OSASM group can access Automatic Storage Management and RDBMS instances.
B. The primary group for the Oracle Grid Infrastructure and Oracle Database owners must be the Oracle Inventory group.
C. The Oracle Grid Infrastructure installation must be owned by the grid user.
D. The Oracle Grid Infrastructure owner owns Oracle Restart and Oracle Automatic Storage Management binaries.
E. The Oracle Grid Infrastructure owner must have OSOPER, OSBACKUPDBA, and OSKMDBA as secondary groups.
F. The same OSDBA group must be used for Automatic Storage Management and the Oracle Database.

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answer:DB

It’s confirmed by the below quotes

https://docs.oracle.com/database/121/CWLIN/usrgrps.htm#CWLIN483

The -g option specifies the primary group, which must be the Oracle Inventory group. For example: oinstall.

You can designate a unique group for the SYSASM system privilege, separate from database administrator groups, or you can designate one group as the OSASM and OSDBA group, so that members of that group are granted the SYSASM and SYSDBA privilege to grant system privileges to administer both the Oracle ASM instances and Oracle Database instances.

If you are creating this user to own both Oracle Grid Infrastructure and an Oracle Database installation, then this user must have the OSDBA for ASM group as a secondary group.

In Oracle documentation, a user created to own the Oracle Grid Infrastructure binaries is called the grid user. This user owns both the Oracle Clusterware and Oracle Automatic Storage Management binaries.

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