Explanation:
Identities with Owner role: Managed1, Managed2, VM1, and VM2 only
Virtual machines assigned to Managed2: VM2 and VM4 only
In Azure RBAC, role assignments can be made to Azure AD security principals , including managed identities (user-assigned and system-assigned) . The SC-300 learning path on Identity Governance and Privileged Access, and the Exam Ref coverage of Azure RBAC, explain that a system-assigned managed identity is a service principal tied to a single resource, and you can assign RBAC at any scope (subscription, resource group, or resource) to that identity. A user-assigned m anaged identity is an independent Azure resource with its own service principal; it can also be granted roles at the resource group scope. Therefore, the assignable principals for RG1 include the two user-assigned identities ( Managed1 , Managed2 ) and the tw o VMs that have system-assigned identities ( VM1 , VM2 ). VM3 does not present a system-assigned identity; its access is represented by Managed1 .
For attaching a user-assigned identity to a virtual machine, SC-300 materials note that the identity and the target resource must be in the same region (often phrased as "user-assigned identities are regional; the identity and the resource must share a region"). Since Managed2 is in West US , it can be associated only with West US VMs-here, VM2 and VM4 .