Which of the following commands can be configured on an IS-IS Level-1-2 device to prevent the Level-1 device from generating a default route?

Which of the following commands can be configured on an IS-IS Level-1-2 device to prevent the Level-1 device from generating a default route?
A . attached-bit advertise never
B . attached-bit advertise always
C . import-route isis level-2 into level-1
D . attached-bit avoid-learning

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Answer: A