Which statement is true regarding the effect of this command on the transaction in Scott’s session（）

• A、The command fails as a transaction is still pending.
• B、The transaction in Scott’s session is rolled back and the tablespace becomes read-only.
• C、The command waits and the user SCOTT can execute data manipulation language （DML） statements only as part of the current transaction.
• D、The command hangsuntil all transactions on the objects in the tablespace commit or rollback， and then the tablespace is placed in read-only mode.