what is the advantage of Lean Six Sigma (LSS) over other process improvement methodologies?

To reduce patient wait times, what is the advantage of Lean Six Sigma (LSS) over other process improvement methodologies?

1. LSS  is more data driven
2. LSS uses DMAIC as a structured problem solving approach
3. LSS engages front-line staff and benefits cross-functional teams through collaboration
4. LSS focuses on the VOC as the key directional driver for the VOP
5. All of the above
6. None of the above
7. Only A and C
8. Only B and D