I think ABC is correct:
B: https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/ALTER-PLUGGABLE-DATABASE.html#GUID-A29491AD-8F0F-4E52-9D94-57FC3FF8FBC7
And PDB$SEED is always opened readonly
SQL> show pdbs;
CON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
2 PDB$SEED READ ONLY NO
3 TEST MOUNTED
5 TEST3 MOUNTED
SQL> alter pluggable database test open;
Pluggable database altered.
SQL> alter pluggable database test save state;
Pluggable database altered.
SQL> alter pluggable database test close;
Pluggable database altered.
SQL> alter pluggable database test3 open;
Pluggable database altered.
SQL> show pdbs;
CON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
2 PDB$SEED READ ONLY NO
3 TEST MOUNTED
5 TEST3 READ WRITE NO
CDE is correct
@Dhanushbh
You have missed the most important part of the question.
After all the steps, that you did, you needed to restart the CDB!
You didn't do that, so your answer is, completely, incorrect.
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RinD
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