Explanation:
Yes
NO
NO
YES - As an administrator, you can lock a subscription, resource group, or resource to prevent other users in your organization from accidentally deleting or modifying critical resources. The lock overrides any permissions the user might have.
NO - The most restrictive lock in the inheritance takes precedence.
NO - If you delete a resource group with a locked resource, the portal UI will give you an error and no resources are deleted.
https://docs.microsoft.com/en-us/azure/azure-resource-manager/management/lock-resources?tabs=json