which statement is true?

You have set Server log Rotation criteria to either size or time. When a domain is in Production
Mode, which statement is true?

A.
Log files are rotated when the server restarts.

B.
Log files are not rotated in Production Mode.

C.
Log files are rotated only when the rotation criteria are met.

D.
Log files are rotated when the rotation criteria are met or rotated when the server restarts

Explanation:
By default, when you start a server instance in production mode, the server rotates
its local log file whenever the file grows to 5000 kilobytes in size. It does not rotate the local server
log file when you start the server.
You can change these default settings for log file rotation. For example, you can change the file
size at which the server rotates the log file or you can configure a server to rotate log files based
on a time interval. You can also specify the maximum number of rotated files that can accumulate.
After the number of log files reaches this number, subsequent file rotations delete the oldest log
file and create a new log file with the latest suffix.
Reference: Administration Console Online Help, Rotating Log Files
http://docs.oracle.com/cd/E13222_01/wls/docs81/ConsoleHelp/logging.html