The correct answer is "the leverage and working capital."
This is an example of the function of money as the leverage and working capital.
The online retailer is making an investment of $100 million in robotics to help speed up its packaging department. This represents a smart investment and use of money because it is going to give him advantages in the packaging time, it reduces time lost and improves the system reducing costs. This way, there is going to be a better income for the retailer.