Quality at the source $\_\_\_\_\_\_\_\_.$

A$.$ is the goal of producing near perfection, with less than $3\mathrm{.}4$ defects per million opportunities

B$.$ refers to the exchange of information with suppliers and customers to reduce costs, improve quality, and speed delivery of goods and services from suppliers to company, focusing on customers

C$.$ is the term that refers to shifting the responsibility for quality adherence to the operators at each step in the value stream, rather than relying on supervisors or quality control experts to discover errors

D$.$ is a system in which production costs are not assigned to units until they are finished or sold. As a result, managers save bookkeeping steps of moving products through various types of inventory accounts