What should be done prior to backing up an IOS image to a TFTP server? （）

• A、Make sure that the server can be reached across the network.
• B、Check that authentication for TFTP access to the server is set.
• C、Assure that the network server has adequate space for the IOS image.
• D、Verify file naming and path requirements.
• E、Make sure that the server can store binary files.
• F、Adjust the TCP window size to speed up the transfer.