Your company`s web server administrator is migrating on-premises backend servers for an application to GCP. Libraries and configurations differ significantly across these backend servers. The migration to GCP will be lift-and-shift, and all requests to the servers will be served by a single network load balancer frontend. You want to use a GCP-native solution when possible. How should you deploy this service in GCP? 

Answer options:

A. Create a managed instance group from one of the images of the on-premises servers, and link this instance group to a target pool behind your load balancer. 
B. Create a target pool, add all backend instances to this target pool, and deploy the target pool behind your load balancer. 
C. Deploy a third-party virtual appliance as frontend to these servers that will accommodate the significant differences between these backend servers.
D. Use GCP`s ECMP capability to load-balance traffic to the backend servers by installing multiple equal-priority static routes to the backend servers.

B

Reference: https://cloud.google.com/compute/docs/instance-groups/adding-an-instance-group-to-a-load-balancer