What is the best way to ensure that IKE/ISAKMP packets are not dropped when QoS is enabled on the uplink interface of the Teleworker router?（）

• A、QoS and IPSec should never be used together. 
• B、IKE/ISAKMP packets are DiffSERV codepoint CS6, so the traffic is never dropped.
• C、Source IKE/ISAKMP packets off the loop-back address. 
• D、Classify IKE/ISAKMP packets so they are appropriately prioritized.