Refer to the exhibit. A network administrator configures a new router and enters the copy starupconfig running-config command on the router. The network administrator powers down the router
and sets it up at a remote location. When the router starts, it enters the system configuration
dialog as shown. What is the cause of the problem?

A.
The network administrator failed to save the configuration.

B.
The configuration register is set to 0*2100.

C.
The boot system flash command is missing from the configuration.

D.
The configuration register is set to 0*2102.

E.
The router is configured with the boot system startup command.