Identify the required steps in the correct order

You are required to migrate your 11.2.0.3 database to an Oracle 12c database. Examine the list of steps that might be used to accomplish this task:

1) Place all user-defined tablespaces in read-only mode on the source database.
2) Use the RMAN convert command to convert data files to the target platform’s endian
format, if required.
3) Perform a full transportable export on the source database with the parameters
VERSI0N=I2, TRANSPORTABLE=ALWAYS, and FULL=Y.
4) Transport the data files forall the user-defined tablespaces.
5) Transport the export dump file to the target database.
6) Perform an import on the target database by using the full, network_link, and
transportable_datafiles parameters.
7) Perform an import on the target database by using the full and transportable_datafiles
parameters.

Identify the required steps in the correct order.

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

B.
1, 2, 4, 6, 5, 3, and 7

C.
1, 2,4, and 7

D.
2, 4, 5, 6, and 7