What will cause a router to enter setup mode? (Choose two.)

A.
The setup command was issued from the privileged mode prompt.

B.
The IOS is corrupt.

C.
The IOS is missing.

D.
The configuration file is missing in NVRAM.

E.
Boot system commands are misconfigured in the running-configuration.

F.
The configuration register is set to 0x2100.

Explanation: