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单选题
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
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