Which option is the Cisco recommended over-subscription ratio for uplinks between the distribution and core layers?

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An engineer is considering uplink bandwidth over-subscription in a Layer 3 network design.

Which option is the Cisco recommended over-subscription ratio for uplinks between the distribution and core layers?
A . 3 to 1
B . 4 to 1
C . 6 to 1
D . 8 to 1

Answer: B