CDE are correct
AB not APP1$SEED created because not uses AS SEED
F is incorrect -> If not have any PDBs plug to the APP container, you can unplug an APP container.
When an application container includes an application seed, and a CREATE PLUGGABLE DATABASE statement is run in the application root to create an application PDB from the seed, the application PDB is created using the application seed. However, when an application container does not include an application seed, and a CREATE PLUGGABLE DATABASE statement is run in the application root to create an application PDB from the seed, the application PDB is created using the PDB seed (PDB$SEED ).
D is correct --
"A new default service is created for the application container. The service has the same name as the application container and can be used to access the application container. Oracle Net Services must be configured properly for clients to access this service."
Ref: https://docs.oracle.com/en/database/oracle/oracle-database/19/multi/creating-removing-application-containers-seeds-with-sql-plus.html#GUID-20B0B12F-A6A5-4403-95FF-64B3A5CC00A9
PDB$SEED was removed.
SQL> create pluggable database APP1 as application container admin user admin1 identified by passord roles=(CONNECT);
create pluggable database APP1 as application container admin user admin1 identified by passord roles=(CONNECT)
*
ERROR at line 1:
ORA-65035: unable to create pluggable database from PDB$SEED <<== E
SQL>
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