The implemented solution retrieves the full organizational hierarchy using a recursive depth-first traversal approach.

The logic is based on a function that accepts:

• A parent organization ID
• A collection used to accumulate child nodes

The function performs the following steps:

1. It retrieves all direct child organizations for the given parent.
2. Each child is added to the output collection.
3. For every child, the same function is called recursively, passing:
   • The child as the new parent
   • The updated collection of results
4. This process continues until all levels of the hierarchy are explored.

This approach ensures that:

• The hierarchy is traversed depth-first
• All descendants of a node are retrieved before moving to the next sibling
• The final output contains the complete organizational tree under the initial parent