Which statement is true about loading data using the conventional path of SQL*Loader（）

• A、Redo is not generated while performing conventional path loads.
• B、Only PRIMARY KEY， UNIQUE KEY， and NOT NULL constraints are checked.
• C、No exclusive locks are acquired when the conventional path loads are performed.
• D、Instead of performing transactions， SQL*Loader directly writes data blocks to the data files.
• E、INSERT triggers are disabled before the conventional path load and reenabled at the end of the load.