which three orders could you perform the following commands to add thread 3 to your database

You decide to change the redo thread of one of your database instances.

Now you have only two threads: thread 1 is currently being used by instance RAC01, and thread 2 is currently being used by instance RAC02.

In which three orders could you perform the following commands to add thread 3 to your database, and ensure that instance RAC01 is using thread 3? (Choose three acceptable orders.)

1 srvctl stop instance -d RACDB -i RAC01

2 ALTER DATABASE ENABLE THREAD 3;

3 ALTER DATABASE ADD LOGFILE THREAD 3 GROUP 6;

4 srvctl start instance -d RACDB -i RAC01

5 ALTER SYSTEM SET thread=3 SCOPE=SPFILE SID=’RAC01′;

6 ALTER DATABASE ADD LOGFILE THREAD 3 GROUP 5;

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

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

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

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

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

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