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Which commands should you execute to troubleshoot and resolve failing health checks on port 80 for your Compute Engine VM instances behind an HTTP(s) load balancer, where no traffic is being routed to the instances?
A
gcloud compute instances add-access-config instance-1
B
gcloud compute firewall-rules create allow-lb --network load-balancer --allow tcp --destination-ranges 130.211.0.0/22,35.191.0.0/16 --direction EGRESS
C
gcloud compute firewall-rules create allow-lb --network load-balancer --allow tcp --source-ranges 130.211.0.0/22,35.191.0.0/16 --direction INGRESS
D
gcloud compute health-checks update http health-check --unhealthy-threshold 10
