[单选题]Examine the following command:ALTER SYSTEM SET ena

ANone of the data definition language (DDL) statements are logged in the trace file.

BOnly DDL commands that resulted in errors are logged in the alert log file.

CA new log.xml file that contains the DDL statements is created, and the DDL command details are removed from the alert log file.

DOnly DDL commands that resulted in the creation of new database files are logged.