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

AThe command fails as a transaction is still pending.

BThe transaction in Scott’s session is rolled back and the tablespace becomes read-only.

CThe command waits and the user SCOTT can execute data manipulation language （DML） statements only as part of the current transaction.

DThe command hangsuntil all transactions on the objects in the tablespace commit or rollback， and then the tablespace is placed in read-only mode.