You are setting up a custom network topology. You need to create a new VPC network that does not automatically create subnets, and then you need to manually add a subnet to it in the us-west1 region.

Which sequence of gcloud commands should you use?

gcloud compute networks create my-vpc --subnet-mode=custom, followed by gcloud compute networks subnets create my-subnet --network=my-vpc --region=us-west1 --range=10.0.0.0/24

gcloud compute networks create my-vpc --subnet-mode=auto, followed by gcloud compute networks subnets create my-subnet --network=my-vpc --region=us-west1

gcloud compute networks create my-vpc --subnet-mode=custom. No second command is needed as custom mode creates subnets automatically.

gcloud compute networks subnets create my-subnet --network=default --region=us-west1