What is the cause of this problem?

Refer to the exhibit.

A TFTP server has recently been installed in the Atlanta office. The network administrator is located in the NY office and has made a console connection to the NY router. After establishing the connection they are unable to backup the configuration file and IOS of the NY router to the TFTP server.

What is the cause of this problem?
A . The NY router has an incorrect subnet mask.
B . The TFTP server has an incorrect IP address.
C . The TFTP server has an incorrect subnet mask.
D . The network administrator computer has an incorrect IP address.

Answer: C

Explanation:

The subnet mast of the TFTP server needs to be in tune with the other network requirements else it wont be possible.