为自己加油

Choose two. Examine this configuration:

1 CDB1 is a container database.

2 APP1_ROOT is an application container contained in CDB1.

3 APP1_ROOT$SEED is the application seed contained in APP1_ROOT and

Synchronized with APP1_ROOT.

4 APP1_PDB1 and APP1_PDB2 are application PDBs contained in

APP1_ROOT.

5 APP1_USER_APP is an application installed in APP1_ROOT at version 1.0.

6 USER1 is a common user in APP1_ROOT and all its application PDBs,

Created when version 1.0 of APP1_USER_APP was installed.

You execute these commands:

$ sqlplus sys/oracle@localhost:1521/cdb1 as sysdba

SQL> ALTER SESSION SET CONTAINER=app1_root;

Session altered.

SQL> ALTER PLUGGABLE DATABASE APPLICATION app1_user1_app BEGIN

UPGRADE '1.0' TO '2.0';

Pluggable database altered.

SQL> GRANT CREATE SESSION TO USER1;

Grant succeeded.

SQL> ALTER PLUGGABLE DATABASE APPLICATION app1_user1_app END

UPGRADE TO '2.0'; Pluggable database altered

SQL> ALTER SESSION SET CONTAINER=app1_pdb1;

Session altered.

SQL> ALTER PLUGGABLE DATABASE APPLICATION app1_user1_app SYNC;

Pluggable database altered.

Which two are true?

A.USER1 can connect to CDB1.
B.USER1 can connect to APP1_ROOT and APP1_PDB1.
C.USER1 can connect to APP1_ROOT, APP1_ROOT$SEED, and APP1_PDB1.
D.
USER1 is defined in APP1_PDB2. 
E.
USER1 can connect only to APP1_PDB1
F.
USER1 can connect only to APP1_ROOT.