What is the result?

Your multitenant container database (CDB) contains pluggable databases (PDBs), you are connected to the
HR_PDB. You execute the following command:
SQL > CREATE UNDO TABLESPACE undotb01
DATAFILE u01/oracle/rddb1/undotbs01.dbf` SIZE 60M AUTOEXTEND ON;
What is the result?

A.
It executes successfully and creates an UNDO tablespace in HR_PDB.

B.
It falls and reports an error because there can be only one undo tablespace in a CDB.

C.
It fails and reports an error because the CONTAINER=ALL clause is not specified in the command.

D.
It fails and reports an error because the CONTAINER=CURRENT clause is not specified in the command.

E.
It executes successfully but neither tablespace nor the data file is created.

Explanation:
Interesting behavior in 12.1.0.1 DB of creating an undo tablespace in a PDB. With the new Multitenant
architecture the undo tablespace resides at the CDB level and PDBs all share the same UNDO tablespace.When the current container is a PDB, an attempt to create an undo tablespace fails without returning an error.