Exam 1z0-1067-21 topic 1 question 36 discussion

You are using Oracle Cloud Infrastructure (OCI) services across several regions: us-phoenix-1, us-ashburn-1, uk-london-1 and ap-tokyo-1. You have creates a separate administrator group for each region: PHX-Admins, ASH-Admins, LHR-Admins and NRT-Admins, respectively.
You want to restrict admin access to a specific region. E.g., PHX-Admins should be able to manage all resources in the us-phoenix-1 region only and not any other OCI regions.
What IAM policy syntax is required to restrict PHX-Admins to manage OCI resources in the us-phoenix-1 region only? (Choose the best answer.)