When allowing the 'Administrators' group to manage block volumes in a specific compartment, what is the correct policy format?

The correct format for allowing the 'Administrators' group to manage block volumes in a specific compartment is represented by the choice that specifies the exact compartment without any additional qualifiers.

In the context of Oracle Cloud Infrastructure (OCI), a policy must clearly define not only the permissions but also the specific compartment where those permissions apply. The correct answer indicates that the 'Administrators' group is granted the ability to manage all resources that fall under the volume-family category specifically within the compartment named "Training-sub2".

Using this format correctly identifies and restricts the scope of the policy to just that specific compartment, enabling effective access control. Such specificity is essential for maintaining security and ensuring that groups only have access to the resources they are intended to manage.

The other choices either refer to the root compartment or use an incorrect hierarchical notation, which is not aligned with how OCI manages compartments. Using specific paths that do not match the actual naming convention or structure of OCI compartments can lead to misconfigured policies and unintended access.