Which method provides a way to consolidate parent-child domain structures using ADMT?

The method that provides a way to consolidate parent-child domain structures using the Active Directory Migration Tool (ADMT) is intra-forest restructure. This process involves reorganizing or restructuring domains within the same forest, which can help in consolidating multiple child domains into a single domain structure.

When using an intra-forest restructure, administrators can simplify the Active Directory layout by removing unnecessary parent-child relationships, leading to a more streamlined and manageable directory service. This is especially useful in environments that have grown complex over time, as it helps to improve usability and administrative efficiency.

Multi-forest migration typically refers to migrating objects across entirely separate forests, which does not specifically address consolidating structures within a single forest. Domain flattening is a broader approach to reduce the complexity of domain designs but does not directly utilize ADMT for managing parent-child relationships. Inter-forest restructuring, on the other hand, involves reorganizing domains across different forests, not just within one, thereby not serving the specific purpose of consolidating parent-child domains within the same forest.