You need to upgrade the IOS of an existing router on your network. The new IOS image is located on a TFTP server that you have set up within the network. What command should you issue in order to download the new IOS version?（）

• A、Router# copy tftp flash
• B、Router# copy flash run
• C、Router(config)# restore flash
• D、Router(config)# repair flash
• E、Router#copy flash tftp
• F、Router# copy start flash