Answer:
D. setup time.
Explanation:
SET UP time can be defined as the amount of time taken to change a machine from the last part of a production lot to the first good part of the next production lot. In high production systems, the amount of repetitive work accounts for a great part of the lead time of the product, the rest is usually set up time.
Period required to prepare a device, machine, process, or system for it to be ready to function or accept a job.
Therefore the use of flexible manufacturing systems, properly sequencing jobs, and properly placing tools will minimize the setup time
