What are the common Best Practices for configuring QoS over a route-based VPN?

What are the common Best Practices for configuring QoS over a route-based VPN?
A. IKE traffic must have a minimum Guarantee of 50% of the external interface throughput.
B. QoS is not supported.
C. Ensure the VTI is numbered.
D. Ensure the VTI is unnumbered.

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