Examine the command： SQL> ALTER USER skd ACCOUNT LOCK； Which two statements are true after the command is executed（）

A. The SKD user cannot log in to the database instance.
B. The objects owned by the SKD user are not accessible to any user.
C. The other users can access the objects owned by the SKD user， on which they have access.
D. The password for the SKD user expires and the user is forced to change the password at the next log i