Which of the following steps does a customer use to upgrade the firmware on the AMM to the latest level?（）

• A、Open a Web browser and log on to the IMM; in the navigation frame, click IMM Firmware Update under IMM Control; click Browse; select the .exe file; click the Upgrade/Update button 
• B、TFTP to the AMM; from the Main Menu, select Update; browse to the downloaded .exe file 
• C、Telnet to AMM; from the Main Menu, select Update; browse to the downloaded .pkt file 
• D、Open a Web browser and log on to the AMM; in the navigation frame, click AMM Firmware Update under AMM Control; click Browse; select the .pkt file; click the Upgrade/Update button