A supplier can save money if they eliminate a step in producing a part in the manufacturing process. There is no customer requirement pertinent to this part of the manufacturing process, nor is there any evidence that the change will adversely affect the functionality of the part. How should the supplier pursue making the change?

a. Calculator A
b. Conduct a thorough testing program and then present results to the customer for their acceptance
c. Implement the change immediately to save money for the company as quickly as possible
d. Solicit the customer's involvement to investigate whether the change would be acceptable