Which two statements about Cisco IOS XE operations are true? (Choose two.)

Which two statements about Cisco IOS XE operations are true? (Choose two.)
A . Cisco IOS XE uses a two-stage configuration method.
B . Using the commit global configuration command, all the committed changes will be persistent across reboots.
C . The copy run start command makes the configuration changes persistent across reboots.
D . The erase start command followed by the reboot command brings up the router without any configurations.
E . There is no concept of a startup-config in Cisco IOS X

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Answer: C,D