Answer: Grant the roles/storage.objectAdmin Identity and Access Management (IAM) role to the Cloud Build service account on the state file bucket.

The error message indicates that Terraform is unable to access the Cloud Storage bucket where the state file is supposed to be stored, due to a permissions issue (Error 403). This is a common scenario when the service account used by Cloud Build does not have the necessary permissions to access the bucket. Option A suggests using local state, which is not a Google-recommended practice for production environments as it lacks the benefits of remote state like locking and collaboration. Option B suggests creating a storage bucket, but the error is about permissions, not the absence of a bucket. Option C suggests granting the roles/owner role, which is overly permissive and against the principle of least privilege. Option D is the correct approach as it grants the Cloud Build service account the necessary permissions (roles/storage.objectAdmin) to access the state file bucket, following Google-recommended practices by applying the principle of least privilege.

Author: LeetQuiz Editorial Team