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 for all 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. 

Answer options:

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

A