Identify the correct order of the required steps.

You want to migrate your Oracle 11g database as a pluggable database (PDB) in a
multitenant container database (CDB). The following are the possible steps to accomplish
this task: 1. Place all the user-defined tablespace in read-only mode on the source
database. 2. Upgrade the source database to a 12c version. 3. Create a new PDB in the
target container database. 4. Perform a full transportable export on the source database
with the VERSION parameter set to 12 using the expdp utility. 5. Copy the associated data
files and export the dump file to the desired location in the target database. 6. Invoke the
Data Pump import utility on the new PDB database as a user with the
DATAPUMP_IMP_FULL_DATABASE role and specify the full transportable import options.
7. Synchronize the PDB on the target container database by using the
DBMS_PDS.SYNC_ODB function. Identify the correct order of the required steps.

A.
2, 1, 3, 4, 5, 6

B.
1, 3, 4, 5, 6, 7

C.
1, 4, 3, 5, 6, 7

D.
2, 1, 3, 4, 5, 6, 7

E.
1, 5, 6, 4, 3, 2