Final answer:
Kanbans are used to achieve SAFe Principle #6 by visualizing and limiting work-in-process, reducing batch sizes, and managing queue length.
Step-by-step explanation:
Kanbans are the primary mechanism to achieve SAFe Principle #6, which involves visualizing and limiting Work-in-Process, reducing batch sizes, and managing queue length. The goal is to create a smooth flow of work, minimizing wait times and optimizing productivity. This helps in identifying and resolving bottlenecks and ensuring that work is completed efficiently.