Benchmarking is:

a$)$ system of performance metrics that seeks to motivate suppliers to perform better.

b$)$ A system of marking defective inbound inventory so it can quickly be identified for return to the supplier.

C$)$ A practice where companies attempt to learn and apply the best practices of other companies.

d$)$ A program where suppliers compete for contracts, but those companies who are outbid are provided advice for winning future contract