Which two statements are true?

You are logged in to the administration console for a domain that is running in Development Mode.
The domain configuration, you select Production Mode, Save, and then Activate Changes. Which
two statements are true?

A.
All running servers must be restarted.

B.
Only the Administration Server must be restarted.

C.
Auto-deployment will no longer be available for this domain.

D.
This change may be made only through the Administration Server’s secure port.

E.
If you decide to go back to Development Mode, uncheck Production Mode in the administrate
console.

Explanation:
C: auto deployment is not allowed in production mode only development mode.
Note 1:
All servers in a domain run either in development mode or production mode.
To configure all servers in a domain to run in production mode:
1. If you have not already done so, in the Change Center of the Administration Console, click Lock
& Edit .
In the left pane of the Console, under Domain Structure, select the domain name.
2. Select Configuration > General and select the Production Mode check box.
3. Click Save, and then, to activate these changes, in the Change Center, click Activate Changes.
4. Shut down any servers that are currently running.
5. Invoke the domain’s startWebLogic script.
The Administration Server starts in the new mode.
6. If the domain contains Managed Servers, start the Managed Servers.
Result

As each Managed Server starts, it refers to the mode of the Administration Server to determine its
runtime mode.
Note 2: Once you have changed to production mode, whether by using a start command
argument, the Console, or WLST, you cannot change back to development mode without
restarting the server.
By default auto deployment is turned off in Production Mode (however it can be later turned on).
Incorrect:
E: if you want to go back to development mode you must change the config.xml file and restart the
admin server. The window shown below shows from developemnt to production NOT production
to development is allowed.
This is in development mode and you can change to production mode but in production mode this
attribute states the word true.

Reference: Administration Console Online Help, Change to production mode