You have a Managed Instance Group (MIG) serving traffic through an HTTP(S) Load Balancer. You want to divert a portion of traffic to a new set of instances for A/B testing without creating a new load balancer. What is the best approach?

*Explanation: To perform A/B testing without creating a new load balancer, the best approach is to **Modify the instance template and use canary updates in the existing MIG** (Option E). This allows you to gradually divert a portion of traffic to new instances within the same MIG, ensuring a smooth transition without the need for additional components. Options A, B, and C introduce unnecessary complexity or new components. Option D (using Pub/SuB. is not designed for this use case and is not the recommended approach.*