If XYZ LTD needs to upgrade the Cisco IOS Software of a Cisco Router, Where is the best place to download the upgrade image file from?（）

• A、The best option is to download it from the Cisco TAC website
• B、The best option is to download it from the Cisco.Com Software support site
• C、The best option is to download it form the Cisco Advanced Services website
• D、The best option is to download it from the TFTP site on Cisco.com