While working in setup mode, a configuration line is typed incorrectly. What should you do to exit setup mode, without executing or saving any of the mistakes you made?（）

• A、Type exit at the setup dialog.
• B、Type close at the setup dialog.
• C、Press the Ctrl-C key combination.
• D、Press the Ctrl-X key combination.
• E、Issue the copy startup-config command.
• F、Issue the 'write e" command.
• G、Issue the "write mem" command